NAME: Dan Kim Aron G. Sanchez
PROGRAM, YR. BS CRIM 3 BLOCK 5
DATE: September 7, 2021 RATING -----Instructor: Mrs. Virginia Lumague
ASSIGNMENT FOR MODULE 2 LESSON 1
FORENSIC3/L
Question:
1. How can you detect semen on clothing?
- Criminal investigators use black lights to detect semen because they're portable and easy to
use. Semen stains can also be detected by sight, by touch (feeling for crusty residue or
crunchiness in fabrics), and chemical testing, but UV is rapid and hands-off.
- Rub stain with provided cotton swab. Test stain by rubbing moistened swab onto test strip.
Semen is present if it turns purple immediately.
Question:
2. Can a person be identified by his semen?
- Although semen can easily be identified through testing, finding sperm may not always be
possible. Forensicscience.ie explains that semen in men who have had a vasectomy does not
contain sperm, so in cases like this further confirmatory tests must be done.