2 weeks ago here in S CA I saw a roadside stop where they were randomly emission testing vehicles. They even had a portable roller setup so the back Wheels could spin during the Emission test.

I was on the opposite side of the Road from it.

I have not seen one of those since about 1994 at which time the waved me on by. I was driving my Volvo Diesel so I doubt if I would have been checked.

If I had been stopped in the Mercedes I have the EGR disconnected and they would have seen that.

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84 300D, 82 Volvo 244Gl Diesel