If 20% of the cannabis tests return false positives, that makes them almost entirely useless Why is this? Let's talk sensitivity and specificityhttps://twitter.com/DrBradMcKay/status/1131731525114839041 …
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Now, let's look at those figures Of all the negative tests, only 1/769 were wrong. That's 0.1%pic.twitter.com/dGcIE6rG6M
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However, of the tests that came back positive, only 39 out of 231 actually had cannabis in their system! That's just 17% correctpic.twitter.com/6PctjVKpLs
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What this means is that, if drug tests are wrong just 20% of the time, a positive value becomes almost meaningless
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For law enforcement, that's probably a really big problem, because they (should) know that only 1 in 7 of their arrests for drug driving are likely to be a result of recent cannabis use
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End of conversation
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