Yes, you can fail a drug test if you consume THCa, and if you consume it regularly, you probably will fail. That’s because cannabinoids like THC build up in our bodies over time; they’re fat soluble and can be nestled away in your body’s fat stores, slowly breaking down over weeks or even months. The more build up there is, the longer it will take to not fail a drug test.
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You can circumvent this by opting for non-THCa products or trying a THC detox. But if you’re going to lose your job or face serious consequences for failing a drug test, it’s not worth it. Just pass on the THCa for now and try something else that won’t cause issues.