DNA is one that concerns me quite a lot. I can see some arguments in favour or retaining DNA on file for a longer term in certain cases - persistent sex criminals comes to mind - but I really think there should be tighter controls about just indiscriminately gathering DNA, and if you’re not found guilty of anything that info should be expunged and this should be independently audited IMO.

Also facial recognition for similar reasons. This feels like it should be the sort of thing to me that needs a warrant to be used, like searching a person’s home. Governments shouldn’t be allowed to just endlessly trawl through the faces of everybody who’s out in public for whatever reason they like. And using it to just sweep protests to (presumably) make a database of protestors should be a big no-no.