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At least all California does is stick a probe up the bus tailpipe and goose the throttle. Here in colorado, you relinquish control of your expensive specialized vehicle to an unknown dude, who then drives it away out of your hands. Then, its placed on a dyno with probes up the talpipe and computer plugged into diagnostic port and stressed under extreme “dyno” load while goosing throttle where drive tires almost stop rolling , looking for exhaust soot “opacity”. No NOX testing, no CO testing, just visible soot Then, depending on facility you are charged up to one hour labor rate. So, stop picking on California, other states are worse. Oh, and dont complain about taxes on license plates. California doesnt hold a candle to ours in colorado. Thank you to the dude called Douglas Bruce (not a lib)who created the Tabor Amendment. Off my soap box for now