So, indeed, the CHP knows what an EV is, and knows the rules for HOV lanes. The problem is when an ICE/non-carpool driver is stuck in traffic in lane #2, and a solo driver speeds by in the passing/HOV lane. The idea is that maybe the p*ssed off driver might see the stickers and regain composure. The problem is when the driver does not see stickers and calls 911 to complain. This is an extra non-urgent call that CHP must respond to. The CHP officer is p*ssed off as well, and if he/she sees that you don't have the proper stickers, then they are compelled to give you the big ticket. So indeed the CHP will pull you over, especially if the got a call. But also they are supposed to ensure compliance with the HOV lane as there are Federal rules on road congestion and state use of HOV lanes.