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HE SHAVED HIS HEAD, should read
Shaving your head doesn’t stop drug testing via hair. It’s almost never head hair. Eyebrows are a typical hair source as is body hair from under the arms or the genital regions. Hair from those sources can go back 24 months of growth records it’s why when there is a court order head hair is never used. Eyelashes are also used of no other hair of 3cm in length is found in the body. Eyelashes grow very slowly and can have a year or two of growth plates only a single hair is needed for mass spectrometry drug testing it’s accurate to the part per billion level. The oil industry hair tests I have never had a head hair taken once it always eyebrows first.