Revise DUI testing to include oral fluids

This bill updates Montana's DUI laws to allow law enforcement to use oral fluid tests alongside blood and breath tests for commercial vehicle operators. It directly affects drivers of commercial motor vehicles by expanding the types of tests officers can request when they have reasonable grounds to suspect alcohol impairment. The key provision adds oral fluid testing to the list of approved tests under the state's implied consent law, giving officers the authority to choose which test method to use. Additionally, the bill clarifies that refusing any of these designated tests results in license suspension, with stricter penalties for repeat offenders and those transporting hazardous materials. The legislation also updates legal definitions to include oral fluid as a valid substance for measuring alcohol concentration in DUI cases.