Unit 3: Safety considerations at crime scene - Practice Quiz

1 What does PPE stand for in the context of crime scene safety?

2 Which item is worn to prevent contamination and protect hands during crime scene work?

3 What is the primary purpose of wearing a face mask at a crime scene?

4 Which of the following is considered a biological hazard at a crime scene?

5 What should be done before entering a crime scene with an unknown chemical smell?

6 What legal document typically authorizes the search of a private premises?

7 What is chain of custody?

8 Why is maintaining the chain of custody legally important?

9 Evidence collected without proper legal authorization may be:

10 Who generally has the authority to declare a crime scene and control access to it?

11 What does a forensic database primarily store?

12 Which database is commonly used to store and compare DNA profiles?

13 What does AFIS help investigators compare?

14 How does a forensic database help an investigation?

15 What does logistics management at a crime scene mainly involve?

16 The term manpower at a crime scene refers to:

17 Why is accurate information sharing important during crime scene management?

18 Why should investigators change gloves between collecting different pieces of evidence?

19 Sharp objects such as knives or broken glass should be collected using:

20 Which type of container is best for storing damp biological evidence to prevent mold growth?

21 An investigator arrives at a scene involving a suspected drug lab with visible chemical fumes. Before entering, what is the most appropriate first action?

22 At a scene with pooled blood from an unknown source, which precaution best reduces the risk of bloodborne pathogen exposure?

23 A team must process an outdoor scene during heavy rain and low temperatures. What is the primary health and safety concern the supervisor should address?

24 Which sequence correctly reflects safe PPE removal (doffing) after processing a biohazard scene?

25 Officers enter a private residence without a warrant to collect evidence, and no recognized exception applies. What is the likely legal consequence?

26 Why is maintaining an unbroken chain of custody legally critical for physical evidence?

27 An investigator discovers additional evidence in plain view while lawfully present at a scene for another purpose. Under what condition is seizing it legally justified?

28 A first responder alters the position of a weapon to render aid to a victim. What is the correct legal and procedural response?

29 A latent fingerprint from a scene has no known suspect. Which forensic database would most likely help identify a match?

30 Investigators recover DNA from a sexual assault case with no suspect. Searching which database offers the best chance of a hit?

31 Cartridge casings from multiple shootings are suspected to come from the same firearm. Which database links them by ballistic signatures?

32 What is a key limitation of relying on a forensic database match as evidence?

33 During initial scene assessment, why is gathering accurate contextual information from first responders important?

34 Which practice best protects the confidentiality of sensitive case information at an active scene?

35 An investigator notices witness statements contradict the physical evidence. What is the most appropriate response?

36 At a large multi-room homicide scene, why is assigning clearly defined roles to team members essential?

37 Who typically holds overall responsibility for coordinating personnel and decision-making at a crime scene?

38 A scene requires simultaneous fingerprint lifting, blood collection, and photography, but only three specialists are available. What is the best manpower strategy?

39 For a scene expected to take 12 hours to process, which logistical consideration is most critical to plan in advance?

40 Establishing an inner and outer cordon at a scene primarily serves which logistical purpose?

41 An investigator enters a clandestine drug lab where volatile organic solvents and unknown corrosive agents are present. The scene is poorly ventilated with pooled liquids. Which sequence of controls best reflects the hierarchy of controls applied correctly to this scene?

42 During collection of a bloodstained knife suspected of carrying bloodborne pathogens, an investigator must balance evidentiary integrity with biosafety. Which combined practice is most defensible both scientifically and legally?

43 Officers respond to a 911 call and lawfully enter a home under exigent circumstances. After securing the scene and finding no ongoing emergency, they continue an extended search of drawers and cabinets without a warrant. Under the plain view and exigent circumstances doctrines, the extended search is most likely:

44 A DNA profile from a crime scene is searched against a national database of profiles. If the random match probability for the profile is , the expected number of adventitious (coincidental) matches is approximately:

45 A major scene requires simultaneous photography, evidence recovery, sketching, and security over 18 hours. A single team has worked 12 hours and shows signs of fatigue and cross-contamination errors. The most sound manpower decision is to:

46 At a large outdoor scene with anticipated rain, a limited number of tents, generators, and lighting units must be allocated. Which logistics principle should govern deployment first?

47 Two independent witnesses give conflicting timelines about when a fire began. Investigators also have a burn-pattern analysis and a 911 call log. From an information-management standpoint, the best approach to resolving the conflict is to:

48 An investigator must process a decomposing body scene with high concentrations of hydrogen sulfide () and ammonia. Standard N95 masks are available. The correct health-and-safety determination is that N95 masks are:

49 A defense attorney challenges DNA evidence, arguing there was a 4-hour gap in the chain of custody where the sample's location is undocumented. The most legally accurate consequence is that:

50 A latent print is searched in AFIS, returning a ranked candidate list. Which statement correctly describes the fundamental limitation an examiner must account for?

51 While collecting evidence at a scene containing a suspected improvised explosive device (IED), which decision reflects the correct integration of safety and evidence priorities?

52 A multi-agency response to a mass-casualty scene suffers from duplicated tasks and communication breakdown. The logistics framework specifically designed to resolve this through unified command and clear span of control is:

53 An investigator receives conflicting field intelligence and lab preliminary results while the scene is still active. To avoid confirmation bias in interpreting incoming information, the best practice is to:

54 A crime scene contains dried blood, used syringes, and possible aerosolized biological material. Which classification and corresponding control best matches the highest applicable risk?

55 Investigators discover incriminating evidence during a search that later turns out to have been based on a warrant with a technical clerical error. Which doctrine most likely determines whether the evidence is admissible?

56 A partial DNA profile matches a database entry, but the entry belongs to a person known to have been incarcerated at the time of the crime. The most scientifically responsible interpretation is:

57 Two biological samples from different sources must be collected in the same room. To prevent cross-contamination, the most rigorous procedure is to:

58 A scene requires specialized skills (bloodstain pattern analysis, digital forensics, and firearms examination) but only generalist officers are on site. The best manpower management decision is to:

59 During a prolonged indoor scene, contamination-control logistics require managing personnel entry. Which control most effectively limits contamination while maintaining accountability?

60 An investigator wants to preserve the evidentiary value of scene information captured digitally (photos, notes, sketches). Which combination best ensures both integrity and admissibility of the digital records?