When data has been identified as no longer needed for the matter it can be removed permanently from the matter. Right click selecting Document Tools - Delete from Matter. Documents which have been produced cannot be deleted or removed from a matter.
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This option is also available for a binder of documents by holding down the CTRL key while right clicking on the binder. This is recommend for larger data set such as junk files. Use the Save results to... option to quickly place large data sets into binders.