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Identifying DNA Evidence
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 |
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