At crime scenes, officers and investigators should not
a. protect the boundaries of the crimes scene
b. let witnesses and victims have interactions with each other
c. maintain the chain of custody for physical evidence
d. take precautions to avoid accidentally transferring evidence

i'm no prfessional but i think it might be B

Explanation:

maby the victims are scared of the crime doer and don't want any trouble, so they say different things to the witnesses.

on june 23, 1972, the president signed title ix of the education amendments of 1972, 20 u.s.c. into law. title ix is a comprehensive federal law that prohibits discrimination on the basis of sex in any federally funded education program or activity.

all i have to say is that people are truly ignorant and don't have anything better to do with their lives.