You could test for metabolites rather than raw cocaine/THC/ethanol/whatever (assuming such metabolites enter the sweat glands, which is beyond my level of pharmacokinetics), although you'd still get fitted up if the coked up pig shook your hand before testing you.
You could test for metabolites rather than raw cocaine/THC/ethanol/whatever (assuming such metabolites enter the sweat glands, which is beyond my level of pharmacokinetics), although you'd still get fitted up if the coked up pig shook your hand before testing you.