Just a thought.....When handed the specimen jar, it should have a temp gauge on it.

You can breathe on the temp gauge or stick your tongue to the clean surface to raise the temp. if unobserved.
LolaGal Reviewed by LolaGal on . Failed substitution - too cold Hey gals and gals, first of all, excellent site, thank you very much for the awesome information. I attempted the substitution method yesterday because i was being prescreened for a job and most definitely showing positive on my home tests. Unfortunately, I live in Wisconsin...with 2 feet of snow on the ground. Suffice to say, the minute and thirty seconds it took me to walk from my job to the drug test facility (literally across the block), my sample had dropped from 99 degrees (i heated it Rating: 5