In Florida - we do not have to have the pollution equipment checked on our cars. We also do not have any inspection stickers at all. Before you start whining about safety - etc - accidents in Florida are like everywhere else. Accidents are caused by the nut behind the wheel.
If you are a backyard mechanic - you can alter your car almost anyway you want. If you draw the ire of a state cop you may be cited for something like windows tinted too darkly.
I took this picture of Jiffy Smog in Las Vegas. You drive up - they test your car - give you a sticker. There are all sorts of things you can do to trick the test. So it turns out being another waste of money. In my opinion - when someone says they are doing something to protect you - cover your wallet.
I guess those orange cones make it look more official.