Question

which is not a challenge of forensic scientists? *
human error and bias
evidence contamination
laboratory backlogs
high costs and time requirements
evidence being accepted in court

Explanation:

Forensic scientists face issues like human error, evidence contamination, backlogs, and high - cost/time requirements. Getting evidence accepted in court is a goal, not a challenge in the same sense as the others.

Answer:

evidence being accepted in court