Banned Accounts
When someone is reported for whatever conduct they are reported for Twitch, staff should have a way to see all the accounts chat logs for other streams and handle accordingly. Since Mods have chat logs within streams I would expect something similar that can flag their comments in all streams when banned as their chat logs are still active even when banned and it'll be easier to compile if needed to report to said agencies. I mention this as when I have reported over hundred pedophiles on Twitch trying to groom and exploit kids, you see their comments in a random stream telling the kid to do X and the challenge gets half done but wasn't handled as this person was banned for another instance, and who knows how many more accounts were affected.
