Now that marijuana is legal, it is very sensible to develop and use tests which focus on the "current" level of THC.  We know that it will be detected as "present" days or weeks after use.  However, the movement toward more specific and sophisticated tests to detect levels which support a charge of "impaired" indicate, IMO, a high degree of "common sense" and Sen. Prozanski's bill melds very well with this new technology.  Gary Crum