Some geniuses may also try to detoxify the drugs ingested. Now this can really save their skin as far as a hair test is concerned. This may not be able to help them with urine drug test because in the urine test, drug is shown up in the urine within a very short duration after the drug is taken in. But, with hair drug test, this may really “fool” the test because in the case of hairs, a drug is shown up in the cortex only after 4-5 days of administration. So, one can take advantage and detoxify the metabolites within that duration and pass out in flying colors!