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:
The moment we take a drug — whether we snort, smoke, or swallow it — our bodies begin to break it down. In the process, metabolites, or byproducts, of the drug are produced, which can linger in our blood, urine (and even in our hair) for long after the initial effects of the drug are felt. Traces of these metabolites are what drug testers look for, since they're a good indication that someone has actually used a drug rather than merely come into accidental contact with it.
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.
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