FBI agent in the Nordean January 6 case caught selectively editing her communications so they wouldn't be produced to the defense:

There are "over one thousand hidden Excel rows of messages" the FBI - and the DOJ prosecutors - did not produce to the defendants.

https://t.me/techno_fog/490

12. Twitter execs weren’t sure about Clemson’s Media Forensics Lab (“too chummy with HPSCI”), and weren’t keen on the Rand Corporation (“too close to USDOD”), but others were deemed just right.