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And while hair-based drug tests are fairly accurate, tests of blood and urine are simply unable to detect the vast majority of drugs, so long as you haven't used for about a week. Heroin, for example, is generally undetectable in urine after three to five days. As the chart below shows, traces of drugs like LSD, morphine, heroin, amphetamines, and alcohol all remain in the blood for just 12 hours or less:
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