128 citations
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January 1996 in “Journal of analytical toxicology.” This study suggests that while hair analysis using GC-MS is a sensitive method for detecting cocaine ingestion, it may not reliably indicate the amount, timing, or duration of drug use due to interindividual variability and multiple incorporation mechanisms.
14 citations
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May 2020 in “Drug Testing and Analysis” This study reports that hair analysis could potentially monitor metformin use in diabetic patients, suggesting a possible correlation between daily dose and concentration in dark hair but not in light hair.
8 citations
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October 2014 in “Journal of analytical toxicology.” This study found that a single application of 'Lye' or 'No-Lye' chemical straighteners significantly reduced drug concentrations in hair samples from both drug-fortified standards and authentic drug users.
July 2023 in “Drug testing and analysis (Print)” Homemade hair treatments can significantly lower drug levels in hair, possibly causing false-negative drug tests.
23 citations
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January 2016 in “Forensic Science International” This study found that in vitro heat straightening of hair reduced THC and cocaine concentrations but increased CBN and BZE levels, suggesting heat conversion of these substances.