Hair analysis for opioids

In contrast to proof of abstinence from alcohol, proof of abstinence for narcotics is by examining dyed/tinted hairpossible.

Hair is not substance-free immediately after the start of abstinence. In the growth phase (anagen phase), newly formed scalp hair reaches the surface of the scalp after about 9 - 14 days. For a proof of abstinence, this means that in the first month after the start of abstinence, aWaiting time of about 2 weeksmust be taken into accountuntil "substance-free" hair has grown back.