Exam #4 Forensic Science Quizzes (5,12,13,17)

Which of the following is true of signs and guidelines of identifying an accelerant-initiated fire?

The presence of traces of severe burning found on the floor (as opposed to the ceiling) of a structure indicates likelihood of arson.

An arsonist may commonly use _____ to start or sustain a fire.

accelerants

Which of the following would be an unbreakable, low-cost, airtight container suitable for the collection and storage of arson-related specimens?

Unused paint cans with friction lids

The process of collecting uncontaminated control specimens from another area of a fire scene to accompany materials suspected of containing volatile liquids is known as _____.

substrate control

If an investigator found an explosive with a velocity of 900 meters per second, how would it be classified?

low explosive

Bullet Corp. is a private company that manufactures explosives for Mortownia's military force. Bullet Corp. is developing small-caliber projectiles and grenades for the country's military. The military already uses trinitrotoluene (TNT) mixtures in its operations. Which of the following can be used with TNT mixtures in the creation of these explosives?

Pentaerythritol tetranitrate (PETN)

Where would a forensic pathologist look for signs of petechiae occurring because of strangulation?

The whites of the eyes

A medical examiner observing contusions or abrasions on a body might suspect which cause of death?

Blunt-force trauma

The _____ relates to the circumstances that led to the death of an individual and is the culmination of the complete investigation.

manner of death

Which manner of death is defined as a non-accidental death resulting from grossly negligent, reckless, or intentional actions of another person?

Homicide

Using what is known about _____, when a medical examiner recognizes inconsistent discoloration patterns, they may suspect that a body has been moved since death occurred.

livor mortis

Putrefaction occurs as a part of _____ and involves microorganisms, such as bacteria, at work within a dead body.

decomposition

Which type of drug is known for inducing sleep and reducing bodily functions such as blood pressure, pulse, and breathing?

Narcotics

Alcohol, phenobarbital, diazepam, and aerosol gas propellants are all grouped together under which type of drug?

Depressants

Under the federal Controlled Substances Act, _____ drugs have a high potential for abuse, have no currently accepted medical use in the United States, and/or lack accepted safety for use in treatment under medical supervision.

Schedule I

Under the federal Controlled Substances Act, a Schedule V substance can be stored where?

In a secured storage area

What is used to reduce the number of possible identities of an unknown substance?

A screening test

Which color screening test helps to determine the presence of marijuana?

Duquenois-Levine

Which breath-test instrument uses chemicals to determine the presence of alcohol?

Breathalyzer

__________ text usually involves a police officer at the scene ascertaining a suspect's physical impairment because of prior alcohol usage.

Field sobriety

A _____% blood-alcohol content is the current legal measure of intoxicated driving of a noncommercial passenger vehicle in the United States.

0.08

The National Highway Traffic Safety Administration recommended "implied consent" laws to address _____ Amendment Constitutional concerns.

Fifth

Which combination of screening and confirmation tests would be acceptable for a toxicological examination of a blood sample?

Immunoassay and gas chromatography/mass spectrometry

To help determine a cause of death related to a fire investigation, a toxicologist might test a deceased person's blood for _____ to determine whether or not they were alive when a fire started.

carbon monoxide

Physical evidence from an arson scene should be:

Packaged in airtight clean paint cans

Which is NOT a high explosive?

Black Powder

Which chemical reaction is associated with a fire?

Oxidation

At an arson scene, the collection of a substrate control would require the collection of a piece of the surface material near the fires origin believed not to have been exposed to the accelerant.

True

Gasoline residues are best characterized by Gas Chromatography

True

Which is a device used to screen objects for the presence of explosive residues?

Ion-mobility Spectrometry

The minimum temperature at which a fuel will spontaneously ignite is called:

The ignition temperature

When investigators search a fire scene, the first focus must be on:

Finding the origin of the fire

Arson investigators must work quickly to collect evidence at a fire scene because:

All of the mentioned answers

Which technique is used to extract explosive compounds from debris?

Acetone wash

The temperature at which the breath leaves the mouth is normally

34 degrees Celsius

How is alcohol introduced in the lungs breath?

Alcohol travels through the bloodstream and is transferred into the alveolus sac

A person with a BAC of 0.40 can fall in a comatose state.

True

A breath test, used to measure alcohol, reflects the alcohol concentration in the pulmonary artery

True

The ratio of alcohol in the blood to alcohol in alveoli air is approximately

2100: 1

After a screening test has been used to determine the identity of an abused drug, the confirmation test of choice is thin-layer chromatography.

False

A confirmatory test for drug analysis is:

GC-MS

The elimination or burn off rate of alcohol averages ___ percent w/v per hour

.015

Alcohol is oxidized in the body primarily in:

Liver

The drug recognition expert (DRE) training program

instructs participants on how to determine if a person is under the influence of one or more drugs

The drugs morphine, heroin, methadone, and codeine belong to which category of drug?

Narcotics

Which of the following drugs is a hallucinogen?

LSD

Which of the following drugs is a stimulant?

Cocaine

Which of the following drugs is a depressant?

Alcohol

Under the controlled substances act, drugs are divided into how many different schedules?

Five

A test that is nonspecific and preliminary in nature is a _____

Screening Test

Schedule III drugs have accepted medical use, an average potential for abuse, and may lead to high psychological dependence.

True

Which of the following color test can be performed for the identification of Cocaine?

Scott

Tests to identify specific substances by the color and morphology of the crystals formed when the substance is mixed with specific reagents is referred to as

microcrystalline tests

All of the following are chromatographic processes found to be applicable for solving analytical problems encountered in the crime laboratory except

Solid-state chromatography

An autopsy is performed by the ______

Medical Examiner

______ refers to injury to the body from a non-sharp or broad object

Blunt Force Trauma

Which is NOT a manner of death?

sharp force trauma

Algor Mortis, Rigor Mortis and Livor Mortis are processes that can be used to determine the

Time of Death

The following image is most likely a/an______

Hard Contact Gunshot Wound

The appearance of an intermediate gunshot wound typically shows

stippling with no soot

The collection of evidence from a tomb site by a forensic anthropologist must include:

- A careful recovery of all visible remains

- All of the above

- A thorough documentation of the site and all evidence

- A search of the surrounding area for related evidence

All of the above

The ___ of a skeleton can be determined by observing the shape of the pelvis and sacrum, the size of the cranium, and the protrusion of the brow bone and mastoid process.

Sex

The stage of fusion of various bones within a skeleton can be used to estimate the _____ of the decedent.

Age

To determine the ancestry of skeletal remains forensic anthropologists analyze:

Cranium