Theres quite a few posts of people using Go #1 synthetic with great results.

I immediately tried to find someone with clean pee. My sister was the only person I knew who doesnt smoke. But, I hear all to often that is now very common to test proper sex in urinary tests... so using my sister's pee was out of the question!
No it wasnt. Gender is not a factor when testing for drugs. What youve heard about "gender testing" is all scare tactics in an effort to discourage cheating on a drug test. Dont fall for it. The methodologies used in drug testing are unisex - they have no ability to determine who the sample came from. Your sisters pee wouldve been fine as long as she was indeed drug free and not overhydrated prior to giving you the sample.