If the test is employment-related, labs practicing in the US are prohibited from performing any type of genetic testing on urine samples collected for a drug test unless authorization is granted by the donor on an entirely seperate and detailed consent form. But dont expect such a form from your employer, for that employees are protected from genetic profiling under the Genetic Information Nondiscrimination Act (GINA) in which was first signed into law in 2005 by then-President Bush and revised in 2008. Labs are only allowed to perform the validity tests outlined by the US Department of Health & Human Services (DHHS) and must apply the criteria for a "substituted" specimen mandated by the DHHS.

With that being stated, any human sample will work as a sub as long as the sub donor is indeed drug-free and not overhydrated prior to giving you the sample.


but do they build a data base to see if two people tested for the same urine?
No. Drug testing is not CSI. Youre practically worrying yourself over what amounts to be nothing.