all drug testing that doesn't serve an actual medical purpose sucks, but hair drug tests are the most Problematic because:
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It's absurdly invasive to be checking whether someone was already following your company's substance policies four months before you hired them. Especially in a THC-legal state! Do you want to know if someone is capable of showing up to work sober, or do you think this is a test of Moral Character
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they always manage to send in bald dudes who are clean-shaven with no body hair and, like, what exactly do you expect me to do here
