Bullet Proof Vest: Mostly averted against bullets – most modern personal weapons put enough kick behind their projectiles that you want hardshell armor with kinetic barriers (see: Armor is Useless, Powered Armor) to save you from those, which is why even the Constabulary uses the equivalent of regular legionary armor just in case. The equivalents, “scale jackets”, and other clothing made from the same materials – usually pharmed spider-silk and related composites – do exist to help deal with shrapnel, knives, needlers, and other lesser hazards.
I become curious as to what the Watch Constabulary *does*, as it appears that the Empire, as soon as it got the necessary tech, went with ubiquitous public surveillance and automated law enforcement.
Well, automated to a major extent, yes, but pure automation can’t cover everything. (While non-sophont “thinker-class” AIs can be creative, they aren’t volitional, so they need someone to tell them to be.)
Thus, the sophont part (which does include sophont digisapiences) of the modern Watch Constabulary exists to provide supervision of the cyberlegius both in general and in those specific cases where it helps to have a soph on the scene to exercise any needed discretion.