Do you people have security guards at your highschools?

Every now and then I hear about how a security guard abused a student or a security guard shot a student but there arent any security gaurds at my school and i cant really imagine there being a guy in uniform with a gun prowling our corridors.

So is security gaurds in highschools a common thing or is it only for specific schools?

Sorry if i kept switching between guards and gaurds, im not sure how its spelt