Listen man, just be happy they didn’t bring anti-magic field grenades.
For real though, even in settings that aren’t high magic, it would be reasonable that law enforcement would have something to neutralize magic. You think you’re the first spell-slinging murder hobo to come through here?




















Yeah, I think the somatic and verbal components were supposed to give away casters (making the sorcerer’s Subtle Spell incredibly valuable socially), but it seems like a lot of DMs ignore or minimize it. But yeah, things like a simple persistent Detect Magic field, especially in critical areas, would make perfect sense. In a high magic setting, every vendor having a trinket that grants them Detect Magic continuously wouldn’t be out of the question.