How long weed stays in your system depends on the type of drug test being used and how frequently you use cannabis.

The amount of time marijuana stays in your system can range from one to 90 days, depending on the test you take to measure it. For example, a urine test for marijuana may test positive for up to 30 ...

Alcohol only stays in your blood for up to six hours, but certain drug tests can detect alcohol as far as three months after ...

After taking prednisone, it may stay in your system for up to about 22 hours. The half-life of prednisone is 3 to 4 hours in an adult. Half-life describes the time it takes your body to get rid of ...