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In reply to the discussion: AZ Appeals Court Says Traces of Inactive THC Qualify for DUI [View all]indie9197
(509 posts)and found several other states that can charge you with DUI for having the metabolite in your blood but no active THC. The link is almost a year old but as of 4/20/12 the states of AZ, DE, IL, IN, IA, RI, and UT were zero tolerance, meaning that metabolite in the blood count as active THC. PA has of limit of 1ng/ml for THC or metabolite so that is pretty much zero tolerance also.
Some states have limits of 5 mg/ml active THC and some states won't charge DUI for THC (MN, NC, VA).
Anyway, laws are changing fast and going toward the 5 mg/ml standard, it seems. If you are a user of the herb it would make sense to learn what the laws are in your state and figure out what it would take to get you to the legal limit.
http://blogs.lawyers.com/2012/04/cruising-the-high-way-safer-than-drunk-driving/