Weed (cannabis) can be detected in urine drug tests for varying lengths of time depending on frequency of use, metabolism, and other factors:
- For infrequent or one-time users, cannabis metabolites are typically detectable in urine for about 1 to 3 days after use.
- Moderate users (several times per week) may test positive for 5 to 7 days.
- Daily or chronic users can test positive for 10 to 15 days.
- Heavy or chronic heavy users may have detectable metabolites for 30 days or longer, sometimes up to 70 or even 90 days in extreme cases
The typical cutoff level for urine tests in the U.S. is 50 ng/mL of THC metabolite (THC-COOH), and detection times can be shorter or longer depending on the cutoff used and individual factors such as body fat, metabolism, and frequency of cannabis use
. In summary, for a standard urine drug test:
- Occasional users: up to 3–4 days
- Moderate users: about 5–7 days
- Daily users: 10–15 days
- Heavy chronic users: 30 days or more, potentially up to 90 days in rare cases
These detection windows reflect the time THC metabolites remain in the body, not the duration of intoxication.
