The private HS I went at had no security, but they're getting "supervisors" (not quite "security guards") for next year. Not a violence problem but more a vandalism/loitering/drugs (pot)/theft problems...

As for badges, they do help to control access to the school... Just like pretty much all office buildings require employes to wear one...

And besides, most schools already have student cards (for the library, computer labs...) so there's not that much cost in having students wear them...

Ammo