Gathering Evidence for Infidelity DNA Testing


Over the years we have had many inquiries about Infidelity DNA Testing. What kind of test is it? How is it done? And, most importantly, how should one collect samples for testing?

So, we have put together a list of instructions and information on how best to collect samples in order to minimize the chance of contamination and to make sure everything is properly labeled and prepared for testing when it arrives at our laboratory.



It is extremely important that all to be tested evidence is handled as little as possible. Gloves are recommended to prevent any extraneous contamination.
To gather special samples, please follow these instructions:

Step 1: Please label an envelope with the following details (use one small envelope per sample):

  • Sample name or description

  • Collection Date

  • Approximate age of sample (date when it may have appeared or item last used)

Step 2: Prep the sample to be mailed:

  • If this is a clothing sample or fabric stain (for example a bed sheet) we recommend you send the entire item to our lab. Please indicate where the stain to be tested is*

    • If you decide the item is too large to send through the mail, the stained area may be cut out and mailed instead.  Please leave one to two inches of space around the potential DNA

  • If this is a smaller item (toothbrush, hair follicles, condom, etc), make sure it dry (please allow to air dry. Do NOT use a hair dryer or any form of heating device to force it to dry) and can fit inside the labeled envelope

  • Do NOT place anything in plastic bags

Step 3: Seal samples inside labeled envelope:

  • Place the special samples into the envelope

  • Seal the envelope with tape

Step 4: Place samples together in a larger envelope and mail to our Laboratory:

  • Compile envelopes containing special samples, oral buccal swab samples, and the completed paperwork together into a larger mailing envelope

  • Mail to our laboratory using a traceable courier service (USPS, FedEx, UPS, etc)

*clothing and fabric samples may be damaged or destroyed when tested

Additional info and ways to collect samples:

DNA, in a dry state, is very stable. Ultraviolet light, extreme temperature and moisture are the primary destructive agents of DNA molecules. There are a few basic rules that must be followed for the proper collection, packaging and storage of DNA evidence.

Wet Stains (Ex: blood, semen, saliva)

Biological evidence should always be allowed to air dry before being packaged in an envelope. Moisture allows bacterial growth to occur, rapidly destroying the material and greatly reducing the possibility of obtaining accurate DNA results. Blow dryers and other heating devices should not be used to force an item or stain to dry.

Pooled biological samples (Ex: blood, saliva, semen)

When dealing with blood, saliva or semen in a pooled or liquid state that may become contaminated or must be cleaned, swab the sample onto sterile cotton swabs (in a pinch Q-tips, with one end cut off, will work) and allow the swabs to air dry before packaging in a clean paper envelope.  Please try to have at lest two swabs per sample.

Dry Stains (Ex: blood, semen, saliva)

Use Q-tips to gather dried blood, semen, or other fluids.

Use Q-tips to gather dried blood, semen, or other fluids.

For best results and highest accuracy an article with stains should be submitted in its entirety. Each article should be separated from another.  We recommend large envelopes, clean paper bags, or clean plastic bags (if the article is completely dry). If the article is too large to be mailed and the stained area cannot be cut out, please follow these steps to help with a proper collection.

  • Place two or three drops of distilled water onto a sterile cotton swab (or a one sided Q-Tip)

  • Rub the swab over the stained area.  Try to transfer as much of the stain as possible onto the swab.

  • Allow the swabs to air dry and package in clean paper envelopes.

Properly collecting, storing, and shipping DNA specimens for analysis helps to ensure accurate results. Most samples in a dry state will offer testable genetic evidence for decades.

For additional questions contact us or email us at