Batter Out of Box in MLB

[DG]

I have called out of box at contact a few times, not many. Never with foot behind plate, always with foot entirely on the plate, or entirely in front of the plate, or entirely out and in front of the box. It's not always a bunt, but usually. It's not too hard to call ball/strike and see a foot on the plate at same time. Probably not more than a half dozen calls in 25 years.