Response to the teacher, law homework help

how would you go about analyzing and comparing these samples? In court, the Defense challenges your findings in this case as circumstantial. How might you defend your trace evidence?

Samples may be taken by the criminalist in his attempt at ruling out family members/roommates living in the suspect’s house, who may have possible access to the car. Why must these samples of hair originate from the same area of the body as the evidence hairs.