Handwarmer packs can be used, but you must remember that your typical handwarmer, alone, can take anywhere from 45-60 minutes to heat a cold bottle of sample to 100 degrees. Thats why you should preheat your sample first, then activate the handwarmer.

Youve mentioned going through the Dunkin Donuts drive-thru, and the 45 min drive.... Don't overlook your vehicles heater as a source for preheating the sample. :thumbsup:
Burnt Toast Reviewed by Burnt Toast on . HELP! pre-emp Labcorp test negative-dilluted RETEST I already started to blaze again! I took a Labcorp pre-employment drug screen on Thursday...I followed the dillution method on this website, I quit for 6 days and I also purchased and used Strip NC for peace of mind (worked for me about 3 years ago)... During the day I drank in addition to Strip NC, about 6 32 oz. Gatorade G2 sport drinks... So I thought I'd pass no problem... test came back negative-diluted but I've been smoking heavy since I took the test 5 days ago!!! HELP!!! Rating: 5