I got a DUI because I had a trace of marijuana in my system and I also had one drink and that was enough to convict me even though passed a field sobriety test. If you have any trace of 2 substances they will charge you. Zero tolerance. I was legal to drive with my BAC but because of the trace amounts of marijuana in my system, they assumed I was under the influence of 2 substances and BAC goes out the window. I got ARD, a year probation, lost my license, and about $5,000 taken from me.