Hey Dallan,
Right now, if I select a source from the Sources list, the only way I can see what Evidences that particular source is attached to is to click on the trash can icon so it shows me, “You need to remove the source from the following evidences in order to delete it,” followed by the list.
Instead of having to take a step toward deleting a source that I don’t want to delete, could there be a second tab in the source window so we can just see that source’s evidences?