Forensic Science Quiz
Questions: 16 · 10 minutes
1. Before examining a seized computer drive, an analyst creates a forensic image and calculates hash values for the source and copy. What is the main purpose of matching hashes?
To help verify that the forensic copy accurately represents the source data
To decrypt every protected file on the drive
To identify the person who last used the computer
To determine whether all files are legally admissible
2. A first responder arrives at a scene where a broken electrical cable is sparking near possible evidence. What should the responder prioritize first?
Photographing the evidence before anything changes
Collecting fragile evidence before specialists arrive
Addressing immediate safety hazards and controlling access
Interviewing every witness inside the scene
3. A visible surface is a smooth, dry glass pane with a suspected latent fingerprint. Which method is commonly suitable for initially developing the print?
Applying ninhydrin, which targets amino acids in porous paper
Using fingerprint powder appropriate for a nonporous surface
Making a dental-stone cast of the glass
Testing the glass with a blood presumptive reagent
4. Which principle states that contact between people, objects, or environments can result in material being transferred?
The principle of superposition
The exclusionary rule
Locard’s exchange principle
The corpus delicti rule
5. An examiner compares a disputed signature with known writing samples. Which material offers the soundest basis for comparison?
A typed transcript of what the writer signed
Multiple suitable known samples produced under comparable conditions
A sample deliberately traced by another person
One signature copied from a social-media image
6. Two bullets share the same caliber and general rifling pattern. What do these shared class characteristics establish on their own?
They prove both bullets were fired during the same event
They uniquely identify one specific firearm
They establish who operated the firearm
They may narrow the possible firearm group but do not uniquely identify a source
7. A DNA profile from a high-quality sample matches one member of a pair of identical twins. What is the key limitation of standard forensic DNA profiling in this situation?
It cannot determine whether the sample is human
It generally cannot distinguish between identical twins
It becomes unusable whenever two relatives are involved
It can identify only the twins’ biological parents
8. Toxicology testing finds a substance in urine but not in a later blood sample. Which interpretation is most appropriate?
The urine finding proves impairment at the time of an incident
The blood sample must have been switched
Urine may reflect prior exposure after the substance has left circulating blood
The substance could not have entered the body
9. An image file’s metadata lists a creation time. Why should an examiner avoid treating that timestamp as conclusive by itself?
Metadata is created only after a forensic examination begins
Image files cannot contain date or time information
Device settings, software, copying, or editing can alter timestamps
A creation time always records when the depicted event occurred
10. A field test produces a color change suggesting that a stain could be blood. Why is additional testing generally required?
A presumptive result indicates possibility rather than definitive identification
Field tests are useful only for digital evidence
A color change proves the stain came from a particular person
Color tests can determine only the age of a stain
11. A fingerprint examiner is told that a suspect has confessed before independently comparing the prints. Which concern does this situation illustrate?
Contextual information could introduce cognitive bias into the comparison
The confession changes the physical pattern of the print
The evidence must automatically be excluded from analysis
The prints can no longer contain ridge detail
12. Microscopy shows that a questioned hair shares several features with hair from a known source. What conclusion best reflects the limits of conventional hair comparison?
Microscopic similarity proves that usable nuclear DNA is present
The shared features establish an individual identification
Hair comparison can establish the exact date the hair was shed
The hair may be consistent with the source, but microscopy alone does not uniquely identify a person
13. A user deletes a file and empties the recycle bin. Why might a digital forensic examiner still recover some or all of it?
Every deleted file is automatically copied to an online account
Its data may remain in storage space until that space is overwritten
Deletion converts the file into permanent system metadata
Operating systems retain a readable duplicate of every file forever
14. Several elongated bloodstains appear on a wall. What is the most scientifically cautious conclusion from that feature alone?
It identifies the exact weapon that was used
It proves that a specific person was standing nearby
It establishes the precise time when the stains were deposited
It may indicate directional movement but requires context and further analysis
15. Forensic entomologists examine insect development on human remains. What can this evidence help estimate when environmental conditions and species are considered?
A minimum period during which insects had access to the remains
The deceased person’s identity from insect DNA alone
The exact minute and cause of death
Whether a named individual was present at the scene
16. Investigators must document each transfer of an evidence package from collection through laboratory examination. What does this record primarily establish?
The scientific accuracy of the laboratory method
The legal guilt of a particular suspect
The exact time at which the offense occurred
The continuity and handling history of the evidence