Not in the active shooter scenario. The standard approach now is to not even wait for SWAT, but to go in as soon as at least two officers are on the scene. The

Not in the active shooter scenario. The standard approach now is to not even wait for SWAT, but to go in as soon as at least two officers are on the scene. The rationale is that active shooters usually stop killing people as soon as they get any kind of resistance, so timing is very important. Of course "going in" does not mean shooting indiscriminately.