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i've read that substituting urine is fairly fool proof as long as the temp requirements are met and you dont have a rancid sample. but is temperature only a factor to the nurse you hand it to right after you "piss", or does it come into play once it's sent off to the lab, and is there any way to tell that the sample has been frozen or not (perhaps the gravity or ph or some other factor could be different from freezing/thawing/being crotched for an hour?) or is this method of substitution really as effective as everyone seems to say?
Last edited by jstix; 08-06-2009 at 09:14 PM.
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