so I've given that one some thought and came away with this: if ice / pd detains you, they're going to take your recording devices. I need my glasses to see enough to walk around.
also, even more gross: they know what to look for, because until recently, ICE was using these devices. That's been banned, but probably only because they're making their own.
https://www.yahoo.com/news/us/articles/ice-banned-meta-glasses-now-154840012.html