The answer is yes. In Texas, DWI is defined an not having the normal use of one's mental or physical faculties by reason of the introduction of alcohol, a drug, a controlled substance, or any combination of substances. If you are intoxicated by reason of the introduction of any substance you can be charged with DWI. It does not matter whether the substance was legal, illegal, or prescribed by your physician. A DWI allegation is a very serious matter and you should consult with an experienced attorney. If you have any questions please feel free to contact my office.
