I guess I should feel lucky up here in the northwoods of New Hampshire. I have a great shop with a guy that always indulges me when I pull out the factory service manual to point out the proper lift points, despite the fact we have had the same conversation every spring for years now.
. Most of the time we spend more time talking about fiero's and how clean and rust free my 33 year old example is, then actually going over the car. He knows that I am a car guy and enjoy busting knuckles on the weekend, and maintenance is always overdone. He always lets me inspect the underside of all of my cars when I get them inspected as well, as I do not have a lift of my own and I like to check for things like leaky seals or other worn items.
Now in NH we only have safety check for all, and OBDII testing for 97+ vehicles. To me, this would keep 90%+ of the vehicles on the road compliant and emissions ready. Its hard to fool the newer ECMs to dismiss S.E.S. errors when the inspection computers looks for compliance. I do not see the real need for pipe sniffing. The ECMs in today's cars sniff the entire time the vehicle is running (so to speak). In fact I am battling a small EVAP leak in a 2001 Bonneville SSEI with only 50k miles. It is seriously a pain in the butt, that an otherwise completely clean, safe, and properly running vehicle can not get a sticker, but at least I know this before I even try to bring it in. No need to waste my time bringing it to a shop only to tell me the pipe sniffer smelled something it didn't like.