I grew up on a farm. Most of my buddies were farmers, and although I detest what farming has become, at an early age I was taught the hard way to stay out of someone's field. Latter I learned that most farmers didn't mind if I alone wandered about in standing corn but don't knock any stalks down. But to stay out of standing beans because when they get dry, they will explode when you walk through them. So, walking standing crops is a quick way to get all hunting shut down on a piece of ground. That being said I don't think anyone would mind if your flushing dog made a pass-through standing corn. But I wouldn't turn a young pointing dog loose in one, because the birds won't hold. You would basically be encouraging it to go out there and just have some fun flushing and chasing all you want! Then be pissed an hour later when it's flushing birds out of range!