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The research I’ve seen shows that general culling is not effective unless it’s focused on high risk animals. This is because the disease is not necessarily density dependent. If it’s frequency dependent, lowering density doesn’t lower the rate it only lowers the number of total animals. The rate of infection remains constant.
I can't imagine each deer not being tested. If they're going to test hunter killed deer during the season it stands to reason that they'd test the animals killed during a regulated event like a culling operation.