At the USPS someone froze the urine...go figure. not sure why...but it had crystals.in it hahahha
A lot of cretins purchase urine, then freeze it to keep it from changing (probably the wrong word to use, but hey, I am a truck driver, not a chemist).
They then plan to thaw it and warm it if called in for a drug test.
I have sent people for drug tests, and then had them arrive at Concentra after taking an inordinate amount of time to get there. We check the GPS history from the the MDT in the vehicle they were driving, and find that they stopped by their home for awhile before going to Concentra. But, getting the urine thawed out and at body temp in time is tricky business and is likely rarely successful. More often, the result is something like what you heard about at USPS. I am sure that some people fool the lab some of the time, but I highly doubt that it happens often.
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At the USPS someone froze the urine...go figure. not sure why...but it had crystals.in it hahahha