I don't pretend to know everything about baseball, but I know a fair bit. Reading the description of this item leaves me totally confused. I don't know what "shack with their right hand" means, and the description also implies that this is something done by pitchers, not hitters. I'm in the dark here.

I didn't know what the issue was that was particular to left handers until I read the description above. Do I even want to knpw what it means to 'shack with your left hand'?

Well. .. it can cross the line. . .it should be checked and observed. . .but I can think of more egregious examples of cheating.