In Arizona it is illegal to operate a motor vehicle while impaired to even the slightest degree. Individuals taking prescription or non-prescription drugs that may potentially cause impairment of any type, need to be aware and concerned about the DUI consequences. This is especially true for medical marijuana patients because of the legal scrutiny associated with the prescription amongst law enforcement and in state courts. Even though you may lawfully be using medical marijuana for medicinal purposes, police officers may still arrest you if you are operating a vehicle and they believe that it has affected your ability to drive. There are two main DUI statutes that apply to someone that the police suspect are driving under the influence of marijuana: ARS 28-1381(A)(1) and ARS 28-1381(A)(3).