Depends on the test to be honest.Also the job you are working for or want.
I believe the answer is: <span> preservation of evidence.
</span><span> preservation of evidence is critically important because the genetic Trace or fingerprints that left on the evidence could be easily erased.
When such evidence is erased, the justice department wouldn't have sufficient proof when they are prosecuting the suspects.
</span>
The answer is B, Is exercising his or her right not to give self-incriminating answers.
