Haven't seen any of these anywhere. We in Washington state used to have roadside DWI checks, but they were ruled unconstitutional (no probable cause), so no more of those. Now they are getting rid of the smog checks as well, as almost no cars fail these days (they waited until our Alfas were past the 25 year cutoff, lol).
The only other roadside type checks I've seen in the past were the old California banned fruit checks, and the Border Agent checks in Texas, etc.
1989 Milano, Shankle Sport
1991 164S, stock
1994 164LS (~Q)
1972 Morgan 27
previously owned since 1964:
62 Morris MiniMinor 850, 67 Austin 1275 Cooper S (Downton 3/4 race), 64 Giulia Sprint GT (1st red one made), 72 Fiat 128 Sedan, 75 Alfetta Sedan, 78 Alfetta Sedan, 78 GTV, 81 GTV6, 86 GTV6