The USLegal Guide to DNA Testing provides essential information regarding DNA testing procedures, particularly in criminal and paternity cases. This guide outlines the different types of DNA testing, how samples are collected, the legal implications of DNA results, and associated costs. Unlike other generic guides, this resource is specifically tailored to help users understand the complexities of DNA testing within legal contexts.
This guide is useful when you need to determine paternity or establish a biological connection for legal purposes. It is applicable in criminal investigations when DNA evidence can exonerate or implicate suspects. Use this guide to navigate the DNA testing process whether you are an individual involved in a paternity dispute or a law enforcement officer handling criminal cases.
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Download a copy, print it, send it by email, or mail it via USPS—whatever works best for your next step.

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If this form requires notarization, complete it online through a secure video call—no need to meet a notary in person or wait for an appointment.

We protect your documents and personal data by following strict security and privacy standards.
If you suspect that anyone in the test is likely to cheat you have two main options: Arrange sample collection all together at the same time so that each person required to give their DNA sample witnesses the other test participants as they take their samples.
There are several points at which a saliva sample can fail to yield high-quality genetic data. Firstly, the saliva sample may have been compromised, either by the collection tube leaking in transit or by a failure of the preservative solution to mix with the saliva after collection.
There are a few things to keep in mind while providing your sample: Do not eat, drink, smoke, chew gum, brush your teeth, or use mouthwash for at least 30 minutes prior to providing your sample. Collect the recommended volume of saliva.
Avoid putting anything in your mouth for at least an hour prior to collecting cheek-cell samples. Foreign particles from food, liquids, toothpaste and tobacco byproducts don't alter the DNA but they can mask it. The consequence is that the sample becomes degraded and therefore unusable for paternity testing.
Gently rubbing the outside of your cheeks. Making chewing motions with your mouth. Smelling or imagining sour foods such as lemons. Thinking about your own favorite food.
Do not eat, drink (even water), smoke or chew gum 30 minutes prior to providing your sample! If we are unable to analyze your first sample, you will be provided with a free replacement kit!
To take a secret DNA paternity test you will need to supply a sample from each person, usually a mouth swab for the father, and a discreet sample for the child, although any number of discreet samples, from anyone is acceptable.
False ExclusionsDNA Paternity tests can falsely exclude someone who is truly the child's biological father for a variety of reasons. One major reason is simple human error.
The DNA test report you will receive shows numbers (in the first column) that indicate each of the 21 loci involved in the DNA testing process. The columns marked allele on the DNA test report contain numbers indicating the two alleles found at each locus (or one number if they are the same size).