This is a great infographic from CloudChasers.com, that discusses the laws surrounding DUI when it comes to marijuana/thc. With the legalization of marijuana, each state is now different – when it comes to their enforcement of laws surrounding DUI.
There a few different types of tests that can be used for testing
Urine tests: DUI testing for urine, doesn’t really work for the occasional marijuana smoker, since the THC will probably not appear in urine.
Blood: Depending on how much you’ve taken, THC can appear in your blood for 12 hours, to 7 days.
Hair: With single use, marijuana will probably not appear in your hair. For regular marijuana smokers, the drug can stay in your hair follicles for months.
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