Crime Scene Investigation Case Studies
Introduction: From the Scene of the Crime to the Desk of the Prosecutor
This chapter introduces methodologies for investigating and reporting criminal offenses beyond the initial response phase. It emphasizes the importance of a comprehensive approach to criminal investigations.
A sample case is included to provide practical illustration of the concepts discussed.
Key terms defined include:
Case file: A comprehensive collection of documents and evidence related to a specific investigation.
Chronological order: Arranging events in the order they occurred, crucial for clear understanding and reconstruction of events.
Complainant: The individual who reports an incident to law enforcement, initiating the investigative process.
Corpus delicti: Evidence establishing that a crime has been committed, a fundamental element of any investigation.
Credibility: The believability and reliability of information or testimony, essential for building a solid case.
Elements: Specific legal components of a criminal offense that must be proven beyond a reasonable doubt.
Fact: A statement that can be proven with evidence, forming the foundation of objective reporting.
Investigation: A systematic inquiry to discover the truth and identify those responsible for a crime.
Jargon: Specialized language or terminology used within a profession, which should be avoided in reports for clarity.
Linkage: Establishing connections between a victim, crime scene, and perpetrator through evidence.
Locard’s Exchange Principle: The concept that every contact leaves a trace, fundamental to forensic science.
Modus operandi: A method of operation
Narrative: The storytelling
Objective: A statement of fact without bias or opinion
Opinions: Beliefs that may not be accurate
Reports: Records of facts in a case
Solvability factors: Statements that are crucial to solving crimes
Suspect: A person that is believed to be guilty of a crim
Victim: A person that has been hurt by the crime
Learning outcomes:
Differentiate between facts and opinions to ensure objective reporting.
Explain the goals of an investigation, including discovering the truth and identifying those responsible.
Examine case narratives to determine effective investigative strategies.
Identify elements of the crime under investigation to build a prosecutable case.
Review case file documents for accuracy and completeness.
Recognize areas for improvement in case files to enhance investigative quality.
The Role of Investigative Case Files
Investigative case files serve as a critical link connecting all phases of the criminal justice system, from initial response to prosecution and adjudication.
The preliminary investigation sets the trajectory for subsequent actions, potentially influencing the case for years.
A well-defined strategy is essential to guide the development and execution of the investigation.
Inadequate police reporting can undermine criminal prosecution efforts.
Audience of Reports and Case Files
Supervisors: Review reports to ensure accuracy and adherence to protocol.
Lawyers: Utilize case files to build legal strategies for prosecution or defense.
Prosecutors: Rely on thorough case files to make informed decisions about charging and prosecuting defendants.
Judges: Evaluate evidence and legal arguments presented in case files to ensure fair trials.
Jurors: Review evidence and testimony summarized in case files to render verdicts.
Social workers: Access relevant information in case files to support victims and families affected by crime.
Government officials: Utilize data from case files for policy development and resource allocation.
Insurance adjustors and investigators: Assess claims and investigate potential fraud using information in case files.
Citizens: Maintain transparency and accountability in law enforcement through access to public records.
Defendants: Understand the charges against them and prepare their defense using case file information.
Media representatives: Report on criminal justice proceedings and inform the public about crime trends and investigations.
Crime lab analysts: Analyze forensic evidence and provide expert testimony based on findings documented in case files.
Other investigating agencies: Collaborate and share information to solve complex cases and track criminal activity across jurisdictions.
Reports must be of sufficient quality and information verified to withstand scrutiny from various stakeholders.
Individuals unfamiliar with investigative techniques should be able to comprehend documented events.
The publication is designed to assist investigators and students in constructing solid, factual investigative case files.
Cases are presented for review, complete with required paperwork and informative narratives detailing events not typically found in traditional reporting formats.
These investigations occur daily within agencies of all sizes, worldwide, highlighting the universal need for effective investigative practices.
There is no one-size-fits-all approach to acquiring the knowledge and skills necessary for successful case prosecution, emphasizing the importance of continuous learning and adaptation.
Scenarios and forms are presented to aid in developing a timeline and investigative strategy for completing the case file.
An investigation is deemed successful when all gaps are filled, alternative explanations are considered and eliminated, and a solid, prosecutable case file is presented to the state’s attorney for review.
It is important to recognize that not all investigations lead to arrests, prosecutions, or convictions; however, every effort should be made to pursue justice.
The ultimate goal is to achieve justice by identifying and prosecuting guilty perpetrators while exonerating the innocent.
Overview of Law Enforcement Reporting
In the United States, over 16,000 law enforcement agencies generate daily reports, contributing to a vast amount of documentation.
Since the inception of formal policing with the Boston Police Department in 1838, crime and offense reports have been a cornerstone of law enforcement.
Despite over 170 years of reporting practices, there remains a lack of uniform methods for collecting and documenting information across agencies.
While technology continues to advance, reporting requirements for law enforcement functions persist, underscoring the enduring importance of accurate documentation.
There exists a shortage of proficient criminal investigators available for hire by police agencies, highlighting the need for ongoing training and development.
Effective detective work requires the development and honing of skills over years of service, coupled with a strong commitment to producing high-quality, documented case files that accurately reflect every aspect of a case.
Depending on the nature of the event, officers may need to complete routine forms meticulously, ensuring that every action taken is accurately recorded.
It is important to recognize that most actions taken by police officers and other first responders do not involve criminal activity; however, proper documentation remains essential.
Reports must be complete, clear, concise, and accurate, regardless of whether they are typed or handwritten, to ensure effective communication and accountability.
Investigative Case Files
The primary focus is on the investigative case file, which serves as a comprehensive repository of all documentation compiled by investigators examining every facet of an event to ascertain the truth and determine responsibility.
Determining whether a crime has been committed and properly evaluating the circumstances are critical steps in the investigative process.
In an advanced era of computers, digital images, and cloud storage, documenting all activities allows authorized individuals to review associated records and arrive at informed decisions regarding the investigation.
Terminology Used
Reports serve as permanent records of all important facts in a case, providing a detailed account of events.
A fact is defined as a statement that can be proven through evidence, forming the basis of objective reporting.
Limited knowledge of an individual not present at the scene necessitates reliance on first-hand knowledge and observations documented in the police report.
Activities and observations recorded in an official report must be accurate and comprehensive, ensuring that all relevant information is included.
Precise information can prove vital in establishing a linkage or association between a victim, the crime scene, and a perpetrator, aiding in the identification and apprehension of suspects.
The ability to accurately convey the totality of information in every instance is paramount, as your work will be subjected to rigorous scrutiny by defense attorneys in the courtroom.
The Investigation Process
An investigation is defined as a systematic and detailed inquiry conducted to determine the truth and allow the facts to prove or disprove allegations.
The process involves efforts to identify those responsible for the events in question and to eliminate innocent individuals from suspicion.
If a corpus delicti (evidence that a crime has been committed) is established, a complete investigative file will present the strongest possible case for prosecution.
An investigator must establish the elements of the crime, which are specific legal aspects of a criminal offense that must be proven beyond a reasonable doubt.
If a suspect is charged with the offense, all elements must be established beyond a reasonable doubt to secure a finding of guilt.
Determining the truth is paramount, surpassing the importance of obtaining a conviction or closing a case without factual basis.
State statutes vary regarding the specific elements of offenses; however, in every criminal proceeding, each specific condition must be identified for an act to be classified as a specific crime.
This book offers carefully structured learning experiences designed to place the reader in the role of an investigator conducting an investigation and completing the necessary paperwork to build a criminal case file.
Maintaining credibility is essential; good investigators remain unbiased and impartial, reflecting these traits in their written work.
Credibility is hard to establish and easy to lose; therefore, diligence and integrity are paramount.
Many cases present challenges such as insufficient evidence, lack of witnesses, and absence of informants to provide leads; however, thorough investigation remains essential.
The investigator will examine the report and determine the solvability factors—statements crucial to solving crimes and prioritizing caseloads.
Data collected are used for compiling statistics, and the victim (if insured) will provide a copy of the report for claim reimbursement; subsequently, the case may be removed from active investigation.
Report Narrative
The narrative section of the report serves as the vehicle for telling the story with content and factual statements, providing a comprehensive account of events.
There is never any room for personal opinion or speculation in this type of report; objectivity is paramount.
Use the first-person, past tense, active voice, and present the events in chronological order to enhance clarity and coherence.
Employ short, clear, concise, and concrete words to explain the situation, avoiding ambiguity and confusion.
Jargon, which consists of words, expressions, or phrases specific to a profession or occupation, can create confusion and potentially lead to delays or dismissals of criminal charges; therefore, it should be avoided in reports.
Note-Taking
Detailed notes can significantly impact the outcome of a case, either making or breaking it; thoroughness is essential.
Take notes on every step taken in every investigation, ensuring accuracy and completeness.
Ensure that the information recorded provides a complete and accurate depiction of the scene, the victims, the witnesses, the physical evidence, and the results of all analyses; attention to detail is critical.
Always carry a personal notebook to write down complete, accurate, specific, and factual information; documentation should be meticulous.
Remember, personal opinions have no place in reports; objectivity is paramount.
Opinions are beliefs that may not be accurate or provable, whereas facts are tangible pieces of information used to make solid decisions and that can be proven.
The job of the investigator is to provide case files that are objective—documents and statements that display no bias, are non-opinionated, fair, and impartial.
As an investigator, you will establish a timeline—a sequence of events—to aid in organizing information and understanding the chronology of the incident.
This timeline will assist in completing all of the paperwork following the chronological order of the incident, ensuring consistency and accuracy.
The importance and accuracy of the sequence can be used to establish the whereabouts of suspects, witnesses, weapons, and subsequent activities in relation to the victim; precision is crucial.
To proceed with an investigation, one of the primary responsibilities of law enforcement officers is to establish the corpus delicti, or “the body of the crime,” demonstrating that an offense has occurred.
This does not literally mean that a body must be discovered; rather, it must be proven that someone has committed an offense through evidence and investigation.
The Purpose of This Book
Each chapter focuses on a different type of criminal offense, providing a comprehensive overview of various scenarios.
Adopt the role of an investigator to gain practical experience in conducting investigations.
Read the case narrative and then identify the steps you will take to conduct the investigation (your investigative strategy), along with the accompanying documentation that must be completed.
Determine what criminal offenses have occurred based on the information presented in the case narrative.
Identify the elements of the crime, those specific factors that constitute the offense.
Create a timeline as you review the narrative to track the sequence of events and aid in analysis.
You will find this timeline extremely useful as events unfold throughout the investigation, and you are the primary person responsible for ensuring that every step is identified and examined throughout the case.
Primary Goals of an Investigation
The primary goals of an investigation are to discover the truth by determining whether or not a crime was committed, identifying those responsible, eliminating the innocent from suspicion, legally obtaining information, and compiling the best possible information for prosecutorial purposes.
An investigator must possess the ability to conduct interviews and write reports, as well as have a thorough understanding of crimes and their elements.
Although state and federal statutes vary, each crime has elements that must be established throughout the investigation to ensure a successful prosecution.
Important Information for Every Investigation
No two cases are alike; each presents its own unique challenges and considerations.
Even in instances involving serial offenders who continually commit the same offense, circumstances invariably vary, requiring individualized attention.
For example, a burglar who consistently targets households during the daytime and enters through the backdoor has established a modus operandi, or method of operation; however, every house differs. Also each victim is different, and each victim deserves a thorough investigation.
Victims
Victims encompass individuals, groups of people, or corporations affected by criminal activity.
Victims can be of any age or physical or mental condition.
A corpus delicti must be established to confirm that a crime has indeed occurred; did a criminal offense actually take place?
Factors must be present that meet the parameters for the event to be classified as a crime, as defined by law.
The perpetrators are identified.
Criminal charges are placed against them.
Complainants
A complainant is the person who reports an incident to the law enforcement agency responsible for responding to that specific jurisdiction, initiating the investigative process.
The complainant may or may not be a victim of a crime; they may simply be reporting suspicious activity or witnessing an incident.
Actions that violate local ordinances, state statutes, and federal laws are classified as criminal acts and are subject to investigation.
The elements of a criminal offense are clearly identified in the state statutes, providing a legal framework for investigations.
Reports and statements contained within the case file must include material evidence and objective proof to support allegations and establish facts.
Suspect Information
Collect as much data as possible.
Proof that a crime has occurred must be established as the first step in the investigation process; without this, further action cannot be justified.
A conviction is one of the final steps in the criminal justice process and cannot occur if reports are faulty or there is no investigative strategy that culminates in an arrest.
Your investigation should identify a person or persons who appear to be directly or indirectly connected with the crime, warranting further scrutiny.
It is crucial to maintain objectivity and avoid making premature judgments; therefore, not everyone encountered in the investigation will be a suspect, emphasizing the importance of remaining unbiased and nonjudgmental.
Locard’s Exchange Principle
Edmond Locard’s exchange principle forms the foundation of modern criminal investigation, asserting that every contact leaves a trace.
Locard’s theory posits that when a perpetrator enters a crime scene or interacts with a victim, they inevitably leave something behind and take something away, resulting in an exchange of physical evidence.
This exchange principle underscores the importance of careful crime scene examination and forensic analysis in identifying and linking perpetrators to crimes.
Investigators must collaborate closely with crime scene investigators (CSIs) as they process the crime scene or examine the victim to ensure thorough evidence collection and analysis.
Elements of a Case File
Incident or offense report: Initial documentation of the crime.
Supplemental report(s): Additional details and updates.
Victim or witness statement(s): Accounts of the incident.
Entry/exit log: Record of individuals accessing the scene.
Photo log: Documentation of visual evidence.
Crime scene rough sketch: Preliminary diagram of the scene.
Crime scene final sketch: Detailed diagram of the scene.
Evidence/property sheet: Inventory of collected evidence.
Chain of custody log: Tracking the handling of evidence.
Investigative strategy: Planned approach to the investigation.
Timeline: Chronological sequence of events.
Miranda rights waiver: Documentation of suspect's rights.
Field interview card: Record of interviews conducted.
Affidavit for search warrant: Justification for a search.
Search warrant: Legal authorization for a search.
Affidavit for arrest warrant: Justification for an arrest.
Arrest warrant: Legal authorization for an arrest.
Suspect statement: Account from the suspect.
Consent to search waiver: Permission to conduct a search.
Request for crime laboratory examination: Submission of evidence for analysis.
Crime laboratory analysis report: Results of forensic testing.
Polygraph examination report: Results of lie detector test.
Autopsy report: Findings from post-mortem examination.
Arson investigation report: Details of fire-related incidents.
Photo lineup form: Documentation of suspect identification.
Vehicle inventory/tow sheet: Record of vehicle impoundment.
Arrest report: Documentation of the arrest.
Booking sheet: Record of suspect's entry into custody.
Developing the Case File
The book contains case files of commonly encountered types of crimes, providing practical examples for investigators.
Accompanying each case is a narrative that will assist you as you review the seemingly endless array of police reports that must be completed for every investigation.
Documentation will be provided to show how witness statements and investigations are intertwined and become part of a case file, illustrating the interconnected nature of evidence.
This collection of documents begins with the first responding officer and concludes with a court trial if it is established that a crime occurred and that the suspect identified probably committed the alleged offenses, demonstrating the end-to-end process of the criminal justice system.
The cases were developed by a group of graduate students studying criminal justice at Charleston Southern University, offering insights from emerging professionals in the field.
The documentation, including photographs, crime scene sketches, statements, search warrants, lineups, and so on, were identified as necessary in order to build a case file that could be presented to the prosecutor’s office to press charges on behalf of the state, underscoring the importance of thoroughness and accuracy.
After you have carefully reviewed a narrative and the case file, you will be asked to answer questions pertaining to the investigation, reinforcing learning and critical thinking skills.
Sample Case: Opossum Incident
CSI Officer Roberts responded to a street address where fire-fighters were extinguishing a house fire, indicating a multi-agency response to a potentially hazardous situation.
The reporting officer, Lonnie Downs, spotted a pool of blood in the street in front of the residence; the residence was on fire, but no victims had been located, raising concerns about potential casualties.
The amount of blood in the street indicated a victim should be found suffering from a severe loss of blood, prompting immediate investigation.
Officer Downs began canvassing the neighborhood and knocking on doors, CSI Officer Roberts took photographs and created a crime scene diagram.
Officer Downs knew how to use string to map out the path of the blood droplets and determine where the indicators converge, demonstrating expertise in blood spatter analysis.
The measurements indicated that the point of impact was the front bumper of the fire engine, suggesting a possible vehicle-related incident.
Officer Downs questioned the fire truck engineer, who stated he had not seen anyone around the area when they arrived on the scene in response to the fire call.
The entire squad deployed immediately and did not treat any patients, indicating a focus on fire suppression rather than medical assistance.
Both a fire supervisor and a police supervisor were summoned to the scene, highlighting the need for oversight and coordination.
A body was discovered underneath the truck, confirming the presence of a victim.
This is an excellent example of well-trained officers beginning to document actions before it is ever determined that a crime was committed, underscoring the importance of proactive documentation.
The victim was identified as an opossum, revealing an unexpected twist in the investigation.
Not all investigations are going to lead to criminal prosecutions; however, every investigation demands thoroughness and adherence to protocol.
That doesn’t mean that shortcuts are taken or required paperwork is not completed because in your opinion, no crime has occurred; professionalism dictates thoroughness in every instance.
Police officers encounter unexpected outcomes throughout their careers, requiring adaptability and resilience.
There is no room for second guessing or taking shortcuts when conducting an investigation and building a case file, emphasizing the importance of diligence and integrity.
Sometimes you will discover no crime was committed; however, every investigation demands that protocols and standard operational procedures be completed to ensure accountability and thoroughness.
Evidence Speaks
The key to success in criminal investigation is to allow the evidence to speak for itself, guiding the investigation and informing conclusions.
An investigator conducts a thorough and ethical investigation and then hands that case file over to the prosecutorial branch of the American criminal justice