Did you read the whole thing? Many hundreds, perhaps thousands over the years have been stopped at checkpoints. I pointed to the carnage of just two that got through.
Ah. You mean the folks stopped and caught for being boozed-up at those checkpoints all represent truly drunk drivers? GREAT HONK you are a sucker.
Pal, just one drunk-driving charge for being over the limit, which in real world means being able perfectly to drive after limiting your evening to three glasses of wine, can destroy the professional careers of pilots, nurses, doctors -- and the worse thing is that a reading from a machine ultimately gages the person's ability to drive or not. So you can wash out about 99 percent of those "many hundreds, perhaps thousands over the years" as being regular, safe-driving folks who'd underestimatd how little booze it takes to go over the machine's number, and WHAM, your willy is wacked.
If cops actually could only watch for drunk drivers as by how they drove, they'd catch more real ones.