You don't need armed raid to audit visa compliance. You need one bespectacled guy with a briefcase. It's true that most of the US law enforcement wants to look like military and tries to use armed troops way out of proportion (I mean, Library of Congress and Department of Education have their owned armed response units, because regular police isn't tough enough to deal with education issues anymore, apparently) - but I hope it's possible to avoid going full Steven Seagal in this case.