I'm not talking about broadcast feeders, not a fan of those because issues with feces. I'm talking about covered troughs and gravity style feeders.I'm unaware of anyone who even attempts such a thing. To your (perhaps) point, yes I guess it is "possible" to have supplemental feed in a broadcast feeder with great care in the concentrated area that would greatly minimize the inherent problems with otherwise unnaturally feeding and concentrating a wild deer population. (Considering how long prions live in the soil and how it's almost impossible to get rid of them once discovered, I'm not sure how feasible it is even in theory though.)