In Texas, DUI and DWI are different crimes. One (I forget which) requires no proof of intoxication -- the officer just says you were impaired and you can fight it in court. Which is why you demand a field sobriety test on video. The other requires the evidence, so should only be charged if you are tested, which is why you demand a blood test. Of course, any amount of cannabinoid metabolites makes you guilty.
DUI would be drugs. You could be found guilty if you took any amount of any sort of medication or even ate something with poppy seeds. Cough syrup could get you busted.
Not strictly. IIRC from "alcohol awareness" class and unless it's changed. DWI is strictly testing over a threshold for alcohol. DUI is all other allegations of impairment.
What I'm saying is: you could test at .01 for alcohol and still be charged with impairment.
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