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Exam 7: Crime Scene Evidence and Experiments

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Question 21

Multiple Choice

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Which type of firearm does not leave striations on projectiles?

A) Shotguns
B) Rifles
C) Machine guns
D) None of the above leave striations

E) A) and B)
F) A) and C)

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Question 22

Multiple Choice

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Under the Federal Rules of Evidence, experiments:

A) must follow a rigid set of standards.
B) are treated the same as any other type of evidence.
C) not admissible in federal court.
D) are admissible if the person who conducted them qualifies as an expert witness.

E) B) and C)
F) None of the above

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Question 23

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Examination of a recovered bullet produces useful information only if the gun from which it was fired has been recovered.

The only thing a defense attorney can do to refute the results of scientific tests performed in government labs is to have the sample tested in an independent lab.

The prosecution wants to introduce the following evidence in a rape case: •Pubic hair recovered from the victim during "rape kit" exam •DNA test results based on semen recovered from the victim during "rape kit" exam •Testimony of a forensic psychologist that the defendant committed the crime How can the prosecution authenticate the pubic hair recovered during the "rape kit" exam?

The prosecution wants to introduce the following evidence in a rape case: •Pubic hair recovered from the victim during "rape kit" exam •DNA test results based on semen recovered from the victim during "rape kit" exam •Testimony of a forensic psychologist that the defendant committed the crime The defense attorney wants to prevent the forensic psychologist from testifying. What should she do?

Officer Green has been dispatched to a hotel that is the scene of a shooting. He sees the following items with potential evidentiary value scattered about the scene: •6 shell casings that are scattered around the room •A dirty towel on the floor near the bullets Officer Green used a magnifying glass but has not been able to determine what is on the towel. He should:

Officer Green has been dispatched to a hotel that is the scene of a shooting. He sees the following items with potential evidentiary value scattered about the scene: •6 shell casings that are scattered around the room •A dirty towel on the floor near the bullets What should Officer Green do first?

A police detective has just received a list of evidence collected at the scene of a murder which occurred in the victim's bedroom, which includes: •Several blood samples were recovered from the area where the victim bled to death •Bullets were recovered from the wall behind the victim's body •Fingerprints found on a window that appeared to be the point of entry Would sending the bullets to a ballistics expert be a good idea?

In a case involving driving under the influence of alcohol, a blood test must be used to establish the blood alcohol level of the suspect.

When collecting evidence at the crime scene:

Crime scene evidence is authenticated by the use of laboratory tests.

Luminol is used to field test suspected drugs to determine if they contain cocaine.

A ballistics expert is used exclusively to determine if a bullet was fired from a particular gun.

All items of real evidence are marked and reviewed by the judge prior to the start of the trial.

The prosecution wants to introduce the following evidence in a rape case: •Pubic hair recovered from the victim during "rape kit" exam •DNA test results based on semen recovered from the victim during "rape kit" exam •Testimony of a forensic psychologist that the defendant committed the crime Which of the following questions will the prosecutor ask to lay the foundation for admission of the DNA test results?

Access to the crime scene should be restricted to as few people as possible because:

A police detective has just received a list of evidence collected at the scene of a murder which occurred in the victim's bedroom, which includes: •Several blood samples were recovered from the area where the victim bled to death •Bullets were recovered from the wall behind the victim's body •Fingerprints found on a window that appeared to be the point of entry The detective wants to conduct an experiment to see if it was possible that the window was already open and the shots were fired by a person hiding in the bushes across the street. What should be done to make sure the experiment will be admissible in court?

Analysis of drugs (controlled substances) accounts for the majority of scientific tests done in government crime labs.

A defense attorney wants to do an experiment for use in court. The experiment is designed to show that eye witness identification of a person in a crowd is not reliable. What must the defense attorney do so that the judge will accept the results of this test at trial? Explain.