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How Long Do Drugs Stay in your System?

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How Long Do Drugs Stay in your System?

How Long it Takes for Substances to Metabolize

Regardless of whether they are prescription or illicit, many people wonder how long it takes for certain substances to metabolize and how long they are detectable through drug testing. The experts at Bluewater Diagnostic Laboratory are here to outline how long various substances stay in the human body.


More often than not, marijuana is detectable in bodily fluid samples for up to 30 days. It can also be detected in hair samples for up to several months.

However, the detection window for testing is heavily dependent on an individual’s smoking/ingestion habits. How much they use and how often can lead to longer periods where marijuana can be detected after a person’s last use.


Lysergic acid diethylamide (LSD), also known as acid, is a hallucinogen that metabolizes pretty quickly. Due to the way that the substance breaks down, LSD cannot be detected by urinalysis. However, blood tests can detect LSD for up to 8 hours after use, and hair testing can detect LSD for up to 90 days.

On the other hand, Mushrooms are not detectable by most forms of drug testing due to the speed at which it metabolizes. However, there are specialized tests available that can detect mushrooms in your hair for up to 90 days.


Barbiturates are central nervous system (CNS) depressants that produce a calming effect similar to that of alcohol. This class of drugs is able to be detected in urine samples for up to 48 hours after being ingested.


Alcohol is a depressant that is metabolized pretty quickly. However, urinalysis is able to detect the presence of alcohol use up to 48 hours after drinking. Hair testing can also detect alcohol use up to 90 days after alcohol is consumed.

Addiction Medicine Testing Solutions in Louisville, Kentucky

At Bluewater Diagnostic Laboratory, we strive to offer solutions to our addiction medicine healthcare partners by delivering timely, accurate results with expert analysis and interpretation. With state-of-the-art testing solutions and advanced technology, we are able to help providers monitor patient compliance by identifying the presence of prescribed or illicit drugs.

Call (502) 538-2980 or visit our Addiction Medicine page for more information on our customized test panels.