DCJS Criminal Investigation Procedures 3 — Questions and Answers
Question 1: What does 'exculpatory evidence' mean in a criminal investigation?
- Evidence that proves guilt beyond doubt
- Evidence that tends to clear or excuse a suspect from guilt (Correct answer)
- Physical evidence found at the scene
- Testimony from law enforcement officers
Correct answer: Evidence that tends to clear or excuse a suspect from guilt
Exculpatory evidence tends to negate a defendant's guilt and must be disclosed to the defense under Brady v. Maryland.
Question 2: An officer discovers a body and suspects homicide. What should be the first investigative priority?
- Identify the victim immediately by searching their pockets
- Secure and protect the scene before any evidence is touched (Correct answer)
- Notify the media to assist with identification
- Begin canvassing the neighborhood for witnesses
Correct answer: Secure and protect the scene before any evidence is touched
Scene security is always the first priority in a homicide investigation to prevent evidence loss or contamination.
Question 3: In Virginia, a consent search requires that consent be:
- Given in writing and notarized
- Voluntary and not the product of coercion or duress (Correct answer)
- Approved by a magistrate beforehand
- Witnessed by two officers
Correct answer: Voluntary and not the product of coercion or duress
Valid consent must be freely and voluntarily given; consent obtained through threats, coercion, or deception is constitutionally invalid.
Question 4: What is a 'modus operandi' (MO) and why is it important in investigations?
- A court order authorizing an arrest
- A suspect's characteristic method of committing crimes, useful for linking cases (Correct answer)
- The official investigation report format
- A type of search warrant
Correct answer: A suspect's characteristic method of committing crimes, useful for linking cases
MO refers to a criminal's signature methods and habits, which investigators use to connect multiple crimes to a single offender.
Question 5: When is it appropriate for an investigator to use a ruse or deception during a suspect interview?
- Never; any deception automatically voids the interview
- Before Miranda warnings are given, within legal limits (Correct answer)
- Only with written authorization from the Commonwealth's Attorney
- Only in federal investigations
Correct answer: Before Miranda warnings are given, within legal limits
Courts have allowed certain deceptive interview tactics before Miranda warnings, but deception cannot be used to overbear the suspect's will.
Question 6: What is the significance of 'Locard's Exchange Principle' in criminal investigations?
- Every criminal has a prior arrest record
- Any contact between persons or objects results in an exchange of trace materials (Correct answer)
- Witnesses always leave the scene before police arrive
- Physical evidence is less reliable than eyewitness testimony
Correct answer: Any contact between persons or objects results in an exchange of trace materials
Locard's Exchange Principle holds that every contact leaves a trace, forming the scientific foundation for trace evidence collection.
Question 7: An officer responding to a burglary finds the door ajar and hears movement inside. What doctrine may justify immediate warrantless entry?
- Plain view doctrine
- Exigent circumstances (Correct answer)
- Inevitable discovery
- Good faith exception
Correct answer: Exigent circumstances
Exigent circumstances allow warrantless entry when there is an urgent need to prevent imminent danger, destruction of evidence, or escape of a suspect.
DCJS Criminal Investigation Procedures 3
What does 'exculpatory evidence' mean in a criminal investigation?