Flash bang and then clear the room.
SWAT should be trained and ready at all times
Yes, I agree. Our police aren't militarized enough already, so let's have enough full time SWAT officers to have a team on duty and suited up 24/7/365.
Call it a 20 man SWAT team, times three shifts per day, times seven days per week, plus enough additional officers to cover for vacations, sick leave, and the never ending training exercises.
I figure about 150 full time officers should do it.