QR codes can contain other types of information aside from URLs (whose content can be altered remotely by the host). For instance, they can contain vCard data, where the subject’s name and business info are hard-coded into the pattern itself, with no remote connection needed (intended for sharing contact info without internet access). That format might be more appropriate for this case.

no one can force you to follow a link you scan, that is not how it works.

the problem i see in this is that when someone is shooting you in the back, it doesn't help much that he is labeled with qr code.

VPN or IP spoofing?

The problem I see is if they're too small. Maybe somebody records an agent doing something fucked up, but unless you can nab a high fidelity screenshot showing the QR code clearly, does it really matter if it's there?

It would be good to have a digital database tracking each agent, saying "so-and-so was spotted at such-and-such place doing this-and-that; here are some photos and video evidence."

Or "Here's a group of ICE thugs brutalizing a bystander. Here are the QR codes that were spotted."

But again, that all depends on people actually being able to scan the QR codes...

I guess it depends on the data. I suggest it’s their full name, and home address.