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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:
However, while determining an exact answer on how long do drugs stay in your system, one needs to take several other things into consideration like the amount of drug the person has taken, whether the drug was taken orally or injected in the body, the person's age, gender, etc.