Washington (CNN) A new report from the Justice Department inspector general found widespread problems in the way the FBI accounted for evidence used to back up allegations in the court applications for foreign intelligence surveillance warrants.

The findings dig further into failures within the FBI in its approach to foreign surveillance of US citizens. So far, the Foreign Intelligence Surveillance Court and Justice Inspector General Michael Horowitz have slammed the bureau for its approach to the warrant application process and its missteps in 2016 and 2017.

The IG went to FBI field offices around the country to look at a sample of Foreign Intelligence Surveillance Act warrants and found widespread problems in the way the FBI accounted for evidence used to back up allegations in the court applications for surveillance.

These are the so-called Woods files that the FBI compiles to make sure foreign intelligence court applications are accurate.

For instance, the inspector couldn't see original Woods files for four of 29 FISA applications, the memo reported, "because the FBI has not been able to locate them and, in 3 of these instances, did not know if they ever existed."

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