regarding using your wife's urine: on occation the lab may check for pregnancy (even in a male sample). happened to a friend and busted.
A) Labs practicing in the US are prohibited by law to perform pregnancy tests on urine samples collected for a drug test without the donors explicit written consent.

B) Even if a lab decides to break the law and conduct such a test devoid of donors consent, the result would not be that the male donor was "pregnant". The result will be reported that the male donor has prostate or testicular cancer. Just as HCG horomones are elevated in an expectant mother, the same HCG horomones are elevated in males with prostate and testicular cancer.

If what youre saying is actually true, then youre "friend" shouldve lawyered up and sued.