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Cannabis use is detectable with hair tests and is generally included in the standard hair test. Hair tests generally take the most recent 1.5 inches of growth and use those for testing. That provides a detection period of approximately 90 days. [5] If an individual's hair is shorter than 1.5 inches, this detection period will be shorter.
A 2022 study in PLOS One, drawing data from almost 90,000 samples from six US states, representing the largest quantitative chemical mapping of commercial dispensary-grade cannabis flower samples to date, found that “commercial labels do not consistently align with the observed chemical diversity.” In other words, many strain names do not ...
Stoners and scientists disagree on the answer. Some ask for a new system.
Hair analysis has been used in occupational, [25] environmental and some branches of alternative medicine as a method of investigation to assist screening and/or diagnosis. The hair is sampled, processed and analyzed, studying the levels of mineral and metals in the hair sample.
Head hair normally growth at the rate of 0.5 inches per month. [67] Thus, the most common hair sample length of 1.5" from the scalp would detect drug use within the last 90-100 days. 80-120 strands of hair are sufficient for the test. [68] In the absence of hair on the head, body hair can be used as an acceptable substitute.
A 2012 review of cannabis use and dependency in the United States by Danovitch et al said that "42% of persons over age 12 have used cannabis at least once in their lifetime, 11.5% have used within the past year, and 1.8% have met diagnostic criteria for cannabis abuse or dependence within the past year. Among individuals who have ever used ...
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Take Wegovy, for example: In those clinical trials, only three percent of adults reported hair loss as an adverse reaction versus one percent on a placebo (hair loss was not a reported side effect ...