The appears to be a case in which there are several significant issues that would impeded the State's ability to the prosecute the charges. Most significantly, is the lack of a chemical test to confirm the presence of a controlled substance in your girlfriend's blood stream. I recommend that you retain an attorney for this case. As for the DWI as a minor, it would depend on how long ago the offense occured and whether she was convicted of DWI or of the offense of driving after consumption of...