Many folks doing this in Atl area?
Not many, but a few. It's certainly not new or rare. It's usually in short yardage situations, and 98% of the time, they are going that way.
You would think it would be a pretty big tendency giveaway, but the team that does it most often has won 4 of the last 5 state championships, and lost the other one in OT. They could have come to the line, told the defense what play they were running, and won anyway. Sniffer backs were the least of the issues when playing them.
We see it occassionally on film, but as I said above, I have never seen a sniffer back take a hand off or go out for a pass. It's almost always just a "heavy set", similar to putting both tackles on the same side of the line.
We have had problems with one team putting these backs in the A gap on punts, breaking the waist of the player next to them, and then having them take a side snap on a fake - a snap not through the snapper's legs, but off to one side. The snap would be legal if it went to a back, but these sniffers aren't backs in those gaps. We pointed that one out to the officials before the game, the team ran it, and the officials still missed it. "Coach, we didn't actually see who got the snap until after you had tackled him."
Gee, and you don't think that was a clue that it wasn't legal?