63 citations,
August 1996 in “Forensic Science International” Cosmetic treatments like bleaching and perming can greatly reduce opiate levels in hair, possibly leading to false-negative drug tests.
20 citations,
October 2017 in “Drug testing and analysis” Drugs localize differently in hair strands based on their properties.
14 citations,
January 1996 in “Journal of Forensic Sciences” Hair can absorb and transfer opiates when soaked in water, with damaged hair absorbing more.
183 citations,
January 1987 in “British Journal of Anaesthesia” Opioid painkillers can cause many side effects, including breathing problems and addiction, but are generally considered safe when used properly.
50 citations,
May 2019 in “Drugs” Cannabinoids may help treat chronic and chemotherapy-induced neuropathic pain, but more research is needed to confirm their effectiveness and safety.