Blood samples waiting to be processed.
One of the reasons that drug tests are a colossal scam is that not all drugs stay in your system for the same amount of time. In fact, some of the least dangerous drugs such as marijuana can be detected in your urine, blood, and hair for much longer than harder drugs such as heroin and meth — meaning that schools, employers, and law enforcement agencies that drug test disproportionately penalize marijuana users.
Attn: has previously reported on how workplace drug testing discriminates against marijuana users, but in order to illustrate just how disparate drug interactions can be, here's a breakdown of how long each drug stays in your system.
1. ALCOHOL
Urine: Three to five days
Blood: 10 to 12 hours
Hair: Up to 90 days
2. AMPHETAMINES
Urine: One to three days
Blood: About 12 hours
Hair: Up to 90 days
3. BARBITURATES
4. CANNABIS
Urine: Seven to 30 days
Blood: About two weeks
Hair: Up to 90 days
5. COCAINE
Urine: Three to four days
Blood: One to two days
Hair: Up to 90 days
6. HEROIN
Urine: Three to four days
Blood: Up to 12 hours
Hair: Up to 90 days
7. LSD
Urine: One to three days
Blood: Two to three hours
Hair: Up to three days
8. MDMA
Urine: Three to four days
Blood: One to two days
Hair: Up to 90 days
9. METHAMPHETAMINE
10. MORPHINE
Urine: Two to three days
Blood: Six to eight hours
Hair: Up to 90 days
With the exception of benzodiazepines (e.g. Valium), marijuana has the longest detectability. If you smoke a joint, it can be traced in your urine for seven to 30 days, depending upon your frequency of use and body type. That contrasts starkly with the detectability of more dangerous and addictive drugs, including heroin, meth, and cocaine.
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