Whats the reason why youre taking a U/A for a doctor?

If you want confirmation, check out the regulations on Specimen Validity testing on the SAMHSA (the regulatory body of the Dept of Health & Human Services) website.

Also, do a Google search of the Genetic Information Nondiscrimination Act (GINA) which was revised and signed into law in 2008 by then-Prez Bush and perhaps which dealt the final death blow to the marketing of the IgG dipstick.

Even if the US did not have laws that protect employees from genetic profiling, Genetic testing is costly and complicated in process. And if employers were really out to deter urine subbing, they would find it to be more cost-effective to implement alternative testing methods, such as hair testing.