There was malware embedded deep into the data which could later be used to throw out a court case due to "spoliation of evidence". Forensic audits of computers are insanely intense, you mess up a single bit of data and you basically lose your evidence. Literally every key stroke must be logged.

"Poison pill" in this case could mean malware that will corrupt or all the data within the packet capture files. There's also a chance it's just planted data that invalidates the rest of the data because no one can tell what is authentic or what is planted.

Sure, They talk about it here: https://rumble.com/vl2dzs-government-agencies-have-infiltrated-mike-lindells-circle.html Just after 10:30 ET on day 3. They seem to be saying that someone infected the PCap data will malicious code. Something that if given out could be bad. We didn't get specifics on it other than the data is being handled by authorities as it relates to a few EOs.