I think it's a good idea too. There doesn't need for there to be undercover cops to be in the game to have lightweight hidden vests. Civs and criminals should be able to buy them legally although at a decent price and it would stop maybe a couple of low calibre rounds before someone starts taking regular damage. As for the heavy one, I think the swat should have vests but not that they would stop unlimited handgun fire, that would be too OP, and since most criminals have handguns, the swat wouldn't even be scared and it would break rp. I think the heaviest vest should be only able to stop maybe 3-4 handgun rounds and 1-2 rifle rounds before taking damage.