Marijuana detection windows

Here is some background information on marijuana. Keep in mind things like frequency of use, hydration, quantity, and type can all affect detection windows. These are just general guidelines that we typically hear toxicologists testify to.

​Schedule I
​Cutoff - 15ng/ml
Detection windows
​Light use - 1-3 days
Moderate use - 3-5 days
​Heavy use - 10+ days
Oral ingestion usually 1-5 days
​1/2 life - 18-24 hours
​Urinalysis shows use and not impairment
​Greater than 150ng/ml generally indicates a recent use
50-100ng/ml is generally a low amount
​Less than 50ng/ml raises the real possibility of a passive or innocent ingestion defense.