Just wanted to say I was in the same boat as other people here. I have used QuickFix a couple years ago but I was worried that the man was gonna catch on to our tricks eventually. I ordered some 5.7 and went in thinking that everything was going to go wrong. Heated it up in the microwave, strapped the heat pad and went in to Labcorp. Perfect 96 degrees on their cup when I poured it in, no hassle at all. Three days later I was still sweating by the phone waiting for the "invalid sample" phone call lol. Instead it was my new boss informing me I passed the test. Someday the labs will catch on but there will always be a way my friends. For now its QuickFix all the way!