[quote=briansd1]The roadside inspection program has been going on for a long time. I’ve seen it in some parts of San Diego.

http://www.epa.gov/oms/regs/im/roadside.pdf

http://cbs5.com/local/smog.check.study.2.1468806.html%5B/quote%5D

Ah ha! Read page 6 of the first document.

“Once a driver agrees to have his or her vehicle tested and has exited the vehicle, the following
inspection protocol is used…”

This is purely a voluntary program.