In the early morning hours of Saturday, 1 December 2018, a California Highway Patrol (CHP) unit observed a Gray Tesla Model S traveling southbound on US-101 at about 70 mph. The CHP unit, a two-officer patrol, pulled alongside of the Tesla and noticed that the single driver/occupant appeared to be asleep. Activating the CHP unit emergency lights and siren failed to wake the driver. Apparently, the Tesla Autopilot, a semi-autonomous driving feature was “assisting” the vehicle from running off the roadway. According to the CHP report, the officers proceeded to pull the CHP unit in front of the Tesla and, using the autonomous crash avoidance safety system, the vehicle was slowed without colliding with the CHP unit. The Tesla driver was awakened by the officers at his door, whereupon the driver, displaying intoxicated behavior, was placed in custody and charged with driving under the influence (DUI). Autonomous vehicles pose this and other challenges for law enforcement agencies.