The investigation did not always yield admissible information or testimony, or a complete
picture of the activities undertaken by subjects of the investigation. Some individuals invoked
their Fifth Amendment right against compelled self-incrimination and were not, in the Office's
judgment, appropriate candidates for grants of immunity. The Office limited its pursuit of other
witnesses and information?such as information known to attorneys or individuals claiming to be
members of the media. in light of internal Department of Justice policies. See, Justice
Manual 9-13.400, 13 .410. Some of the information obtained via court process, moreover, was
presumptively covered by legal privilege and was screened from investigators by a filter (or
'taint') team. Even when individuals testified or agreed to be interviewed, they sometimes
provided information that was false or incomplete, leading to some of the false-statements charges
described above. And the Office faced practical limits on its ability to access relevant evidence as
well -- numerous witnesses and subjects lived abroad, and documents were held outside the United
States.