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Integrity

Home > Evidence Handling Procedures > Types of Evidence > Biological Evidence > Integrity
shirt, pants, and bag with shoes hanging inside an enclosed paper case on rollers.

Mobile evidence-drying cabinet

Image courtesy of
Tri-Tech Inc., Southport, NC

The power of DNA testing is such that examination of biological items can produce very compelling evidence.  However, attention must be paid to degradation, contamination, and safety issues.

Although DNA is chemically robust, it can be degraded by environmental factors such as moisture and sunlight.  It is recommended that biological evidence be air dried as soon as possible and is always kept in paper packaging.  The techniques used to develop DNA profiles are extremely sensitive.  It is important to wear protective clothing (e.g., gloves and face masks) during collection and handling to prevent contamination from other biological factors, such as sweat and saliva.

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