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Making Your Own DNA Kit

While having your child's fingerprints on hand is very important, DNA evidence, when properly preserved, can assist law enforcement a great deal. Please take the following easy steps to preserve the DNA of your family members properly.

Step 1

Using a Styrofoam cup have your child make a dental impression by biting down on the cup hard enough to see the upper and lower imprints. Label the cup with your child's name as well as noting which is "upper" and "lower."

Step 2

Pull 4-5 strands of hair out of your child's head at the root of the hair and place it in an envelope labeled with your child's name and date of collection. You can also save fingernail and toenail clippings in the same envelope.

Step 3

Allow a freshly blood-stained Band-Aid to air-dry overnight and seal it in a small envelope. Then place it in a non-plastic container. Be sure to label it with your child's name and date of collection and place it in the freezer.

Step 4

Take a clean/sterile cotton swab and rub it inside your child's cheek, dampening it with saliva. Allow to air-dry overnight and seal it in a small envelope. Then place it in a separately labeled non-plastic container and preserve in the freezer.


Preserving DNA Samples

In a recent Task Force Report and Update issued by the State of California Department of Justice regarding the subject: Post conviction DNA Evidence Retention and Storage, storage in a dried condition, frozen storage, or in a controlled room temperature environment with little fluctuation in temperature or humidity are recommended.

  • Plastic is not recommended for storage of biological evidence.
  • If samples are stored in the family freezer, it is critical that the samples are not thawed, and not contaminated by other items in the freezer.
  • Do not allow frozen DNA samples to thaw as evidence will be destroyed.


External Links

Amber Center for Missing & Exploited Children at 1-800-541-0777 or

This City of Stockton webpage last reviewed on --- 3/21/2011