Amphetamine use may not cause hair loss, "geezer" traits are normal aging, not all educated older people are stereotypes, and metronidazole can rarely cause lung disease.
Amphetamines may not directly cause hair loss.
Forensic hair analysis for drugs is now more reliable and accurate.
2 citations
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July 1988 in “JAMA” Amphetamines may not directly cause hair loss, as the type of thinning seen with their use differs from severe alopecia.
65 citations
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May 2001 in “Journal of Analytical Toxicology” Basic drugs like amphetamine are absorbed more in darker hair than lighter hair.