Since only a few cells are needed for a useful DNA sample, the list below identifies some areas at the crime scene or on the victim that may contain valuable DNA evidence. Remember, even though a stain cannot be seen, there may be enough cells for DNA typing. Furthermore, DNA does more than just identify the source of the sample; it can place a known individual at a crime scene, in a home, or in a room where the suspect claimed not to have been. The more victim service providers know about properly identifying, collecting, and preserving DNA evidence, the more powerful a tool it becomes.
| Possible Location of DNA Evidence | Source of DNA |
| Bite mark or area licked | Saliva |
| Fingernail scrapings | Blood or skin cells |
| Inside or outside surface of used condom | Semen or skin cells |
| Blankets, sheets, pillows, or other bed linens | Semen, sweat, hair, or saliva |
| Clothing, including undergarments worn during and after the assault | Hair, semen, blood, or sweat |
| Hat, bandanna, or mask | Sweat, skin cells, hair, or saliva |
| Tissue, washcloth, or similar item | Saliva, semen, hair, skin cells, or blood |
| Cigarette butt; toothpick; or rim of bottle, can, or glass | Saliva |
| Dental floss | Semen, skin cells, or saliva |
| Tape or ligature | Skin cells, saliva, or hair |
From Understanding DNA Evidence: A Guide for Victim Serice Providers, May 2001, Brochure, National Institute of Justice and Office for Victims of Crime
