As the primary agency responsible for patrolling and enforcing laws on Arizona's highways and interstates, AZDPS troopers regularly respond to major collisions involving serious injuries or fatalities. Depending on the circumstances, the involved driver(s) may face criminal charges, especially when impairment is involved. This is when our Vehicular Crimes Unit (VCU) detectives step in, utilizing a foundation of math and science to piece the evidence together, helping ensure justice for the victims. In this episode, Detective Zach Cousins talks about the methods utilized by our detectives and shares his experiences in VCU and throughout the department.