I live in one of the highest ticket issuing areas in TX (google selma TX speeding ticket) and have NEVER recieved a ticket.....funny what happens (or doesn't happen) when you pay attention to driving and follow the law.
It also helps when you live in a place and KNOW its a speed trap ... but their "cash cow" is all the non-local traffic on I35 that passes through there.
As my wife's family is from Brackettville and we have a son that lives in SA, I travel that road all too often. I did a Google search as you suggested ... and after reading all of that, trust me ... I will never exit I35 there nor spend one of my hard earned dollars within the Selma city limits. Hope all the businesses in Selma appreciate what the City is doing for them.