Depends: Hair grows at varying rates among different racial groups. The average is about a half inch per month. If your hair is more than a half inch long they will likely find traces of drug along the shaft if the test is specific enough.
Answered 6/9/2016
1.2k views
4 doctors weighed in across 4 answers
A doctor has provided 1 answer
2 doctors weighed in across 2 answers
90,000 U.S. doctors in 147 specialties are here to answer your questions or offer you advice, prescriptions, and more.
Ask your question