Detective: Laser-printer drums are

Answer choices

1. A

   No Impact4% picked this

   Criminals are unlikely to use their own laser printers to produce

   This choice discusses the likelihood of a criminal using their own printer, which is irrelevant to the reliability of matching blemishes to nicks and determining the specific printer source.

   4%
2. B

   No Impact3% picked this

   Drum nicks are usually so small that it requires skill to accurately determine their

   This mentions the skill required to determine the size and shape of a blemish but doesn't directly undermine the reliability of tracing documents to specific printers once a match is made.

   3%
3. C

   Correct76% picked this

   The manufacturing process often produces the same nick on

   Why this is right

   This suggests that the same nick may be produced on several different printers. Therefore, even if a blemish is matched to a nick, multiple printers could have the same defect, casting doubt on whether we've identified the specific printer source, thereby undermining the reliability of the tracing method.

   Skill tested: Weaken · how this choice captures the argument's function is the move to repeat next time.

   76%
4. D

   Weaker Impact11% picked this

   Blemishes on documents are sometimes totally concealed by characters that are

   This indicates that blemishes might be totally concealed, but the argument relies on cases where blemishes are found and matched, so it hardly impacts the core claim about tracing printers. If blemishes were always concealed, then the Plan wouldn't be feasible. But sometimes just means "at least once".

   11%
5. E

   No Impact6% picked this

   Most suspicious documents are not produced on

   This notes that suspicious documents are usually not on laser printers, which is unrelated to whether the blemish-matching method reliably works for those that are on laser printers.

   6%