How Long Does It Take Weed to Leave Your System?
The half-life of a drug is the time it takes for the body to metabolize and eliminate half of the substance. While there are a variety of cannabinoids, THC is the one most drug tests look for. In the body, THC is broken down into metabolites, which are stored in body fat until finally being excreted through feces and urine.
Some marijuana metabolites have half-lives of 20 hours, but others can be as long as 10–13 days. It can ultimately take three to five half-lives for these metabolites to be completely eliminated. This means it can take between five and 65 days for marijuana to be completely eliminated, depending on factors like how often marijuana is consumed, body fat percentage, genetics and others.
How Long Does Weed Stay in Urine?
Urine tests can show recent marijuana use (not current intoxication) because of the delay between use and the body breaking THC down into metabolites. It can take an estimated one to four days for marijuana to be undetectable in urine, though some studies have shown detectable levels for up to 70 days with chronic use.
How Long Does Weed Stay in Your Blood?
Because marijuana stays in the bloodstream for a short time, blood tests are not usually used for this purpose, with the exception of automobile accidents and some roadside sobriety checkpoints. It can take an estimated 36 hours for marijuana to be undetectable in blood, though some reports suggest up to seven days with chronic use.
How Long Does Weed Stay in Your Hair?
Hair tests are not reliably able to detect marijuana use or to determine the amount consumed. Each centimeter of hair accounts for about a one-month period of time, so the detection period depends on hair length but is generally 90 days. First-time drug use in the last seven to 14 days cannot be detected due to the time that it takes for marijuana to reach the hair.
How Long Does Weed Stay in Your Saliva?
Like blood, marijuana is present in saliva for a short time. As a result, a saliva test could show current intoxication but would not indicate level of intoxication or impairment. Marijuana is detectable for an estimated 34 hours in saliva.
How Long Does Weed Stay in Breastmilk?
Breastmilk can contain THC for up to six days after use and can affect the newborn’s brain development, resulting in hyperactivity, poor cognitive function and other long-term consequences.