- Sloughed skin cells.
- Fecal material.
A DNA profile may also be obtained by swabbing items thought to have been handled by a perpetrator. This type of evidence is sometimes referred to as “touch DNA.”
The power of DNA testing is such that examination of biological items can produce very compelling evidence. However, attention must be paid to safety, contamination and degradation issues.
Biological evidence may be detected by any of the following:
- Visual inspection.
- Alternate light source.
- Chemical enhancement, such as luminol.