The Police Are Searching for a Serial Rapist

The police are searching for a serial rapist.  They have few leads, such as a description of the assailant, or other information that would be helpful, in identifying the rapist.

A) One of the victims scratched her assailant and as a result the police were able to secure skin and blood samples. The police would use ____ to help determine if any matches existed.
B) telephone call logs
C) surveillance camera evidence
D) DNA databases
E) facial recognition software
F) credit card receipts