Question: Can I enable drag out but not allow dragging within the tree?

I have an existing application that currently searches a value entered and returns a list of nodes that can be dragged over to a new box that is used to build the where clause in a query. However, it won't let you drag within the search tree results, that data is final/read-only. The problem is if I can set canDrag to true, I can drag within the tree. Is there a way to allow for dragging outside the tree but not within the tree?