With MA ez-pass, the enabling legislation specifically forbade the use of it for speed patrolling. (This may have been limited to i-90 which was the only thing that used it at the time.)
Wnen they implemented seat-belt laws, they (in at least some places) said that it would not be used as the primary reason to pull you over, it would be a secondary infraction. That changed. They can tell you whatever you need to hear to get you to vote for it, then change the law later.
