bloody hell, really! yes, is some places they do! I have dealt with knives, guns, weaponised dogs, needles, machetes, stabbings, murders, drug dealers, deaths from overdoses, violent assault, threats, gang warfare, lock downs, arson, injuries from flying furniture, life threatening allergies, life threatening medical conditions, broken bones, giving first aid as someone has bled to death, children dying in stolen cars, (in the lunch hour as well as in the evenings and no, I wasn't actually a physical witness to that particular incident, just the poor soul who had to ring parents and say their children had left the school premises and not come back...) I have also dealt with criminal parents, child sexual exploitation, groomers, child abuse and neglect, children getting into county lines...
I made a light hearted throw away comment about teachers being emergency services, but actually, the response has shown that people have little to no understanding of what teachers are dealing with. I've stood between students and a knife killer more than once in my career , and dealt with all manner of violent crime and life threatening medical emergency. So have many teachers. I've been knocked out by flying furniture, and had blood drawn on other occasions, and lead children out of smoke filled corridors after arson attacks.
Some people have NO idea.