Summary of Key Concepts in Criminal Investigation

Criminal Investigation Process

Key Components

  • Involves: Victims, Suspects, Investigators, Witnesses.

Victims

  • Reasons for non-reporting crimes:

    • Fear of wasting police time.

    • Delay in discovering crime.

    • Embarrassment or humiliation.

    • Personal motives for retribution.

    • Distrust of police (not in textbooks).

  • Importance of victim communication to reduce crime and encourage reporting.

Victimology

  • Studies experiences of victims and interactions with offenders.

  • Aims to reduce victimization opportunities and understand offender motives.

  • Special considerations for vulnerable populations: intimate partner violence, children, elderly, disabled.

  • Victim advocates play a key role in supporting victims through the justice process.

Suspects

  • Investigation begins with assessing:

    • Motive: Why the crime was committed (not mandatory for conviction).

    • Opportunity: Were they present or could they have been present?

    • Means: Ability to commit the crime based on access and knowledge.

  • Identification methods: Eyewitness, fingerprints, DNA, suspect descriptions.

  • Field identification and photographic line-ups are used to verify suspect involvement.

Investigators

  • Pathway to becoming a detective includes:

    • Starting as a uniformed officer.

    • Opportunities in state and federal agencies.

  • Essential characteristics for investigators: Communication skills, motivation, thoroughness, teamwork.

  • Specialized training offered by criminal justice academies and law enforcement agencies.

Witnesses and Informants

  • Witness types:

    • Primary: Direct information about a crime.

    • Secondary: Relevant information aid.

  • Eyewitness identification can be unreliable but is often compelling.

  • Informants provide crucial information and can be confidential or reliable based on past accuracy.

Interviews

  • Should be brief and non-accusatory to gather relevant information.

  • The environment for interviews should minimize distractions.

  • Interview directing techniques include self-awareness and managing the conversation.

Interrogations

  • Effective interrogations are essential for gathering suspect statements.

  • Utilize strategies that promote a safe environment for suspects to speak truthfully.

  • Preparation for interrogations involves reviewing reports, understanding legal requirements (Miranda rights), and establishing rapport.

Technology in Investigations

  • Technology impacts investigations through:

    • Location tracking via smartphones.

    • Recording devices for crime scene documentation.

    • Drones for surveillance.

  • Detection of deception through observation of body language and physiological responses.