Thanks for all the replies. I really appreciate it. I think I'll wait to see if I get a few more replies, but in the meantime I may as well freeze a few bottles of my own urine since I'm still clean. I think it may even be over 4 months now since I stopped. I'll test it before I freeze it just in case.

KW - I see your point. You can keep the synthetic urine unfrozen for at least a year, right? And I think you can also carry it around with you, as long as you keep it in a cool dark place until you need to heat it up for a test?

However, I simply don't want the stress of working for a company that does random testing, so I should never face that situation. I work in the financial services field, and no company that I have ever worked for performed random drug testing or had it as a company policy.

I guess my REAL question is this:

What could possible go wrong with synthetic urine? Are there any tests that they can legally use, even if only on very rare occasions, that will detect synthetic urine, or will at least detect the absence of something in the synthetic urine, and thus cause a person to fail the test?

Also, is my own clean urine 100% fail proof, as compared synthetic urine, which is maybe 99.99% fail proof.

I also have one other kind of strange question. Can I just piss in a plastic sandwich bag, seal it and freeze it immediately? Would that be a fine way to store it for 6-12 months if necessary? This way I could freeze 4 or 5 bags with 6-8 ounces each, so that I would have plenty in each sample. I plan on thawing it and pouring it into a urinator or a similar product, so I obviously won't be bringing the sandwich bag with me to the test.

Thanks again everyone. Your answers so far have me about 90% sure of what I need to do, but a little more information wouldn't hurt. Any additional information, especially answers to the 2 topics above, would be greatly appreciated.