i wouldn't worry to much unless they plan on running your sample though a gas spectrometer
...the head shops sell cheap shitty kits like everyone else uses though...
perhaps a little piece of mind for a few bucks there?
I sample while I make my Budder so no if you do it like mine..
But just making it unless you were real messy doing it, I wouldn't worrie.
Sucks you have to deal with random tests :0(