Leaving already checked information from future views in a case

I have just run over some different persons in an investigation. When doing a search for the persons info I get a lot of informations that I check an find is not related to the person I''m investigating. When doing futher analysis of eg. his mailaccounts some or a lot of the some hits will show up again, and I think it would be a good feature to be able to mark an entity as "not wanted" or "not to be shown" again during this specific investigation saving a lot of time doing double checking.

Thanks for a nice tool, I''m looking forward to whatever you find out to implement of new features... :-)