There are slash resistant, and stab resistant vests, slash resistant is rated to protect from a hard slash from a very sharp edged weapon (they are rather thin), while the stab resistant is resistant to hundreds of pounds of force behind a sharp thin pointed device (examples: arrow, shank, knife point, nail, etc.
Kevlar for those who dont know is used in snake proof boots, and gloves, search gloves (which are very thin to provide good feel while doing seaches on suspect), vests (stab, slash, and bullet resistant).
Being a long time reptile hobbyist I have experience with these thin gloves that are completely resistant to viper and elapid fangs, they are very very thin, and soft, are made from thin kevlar (turtle skins, the name seems to ring a bell, but not 100% positive). I always preferred to handle them in a way as to not put myself at risk of being bitten, but maybe Im alot more responsible of a reptile handler.
Kevlar lined search gloves will prevent you from being stabbed by a dirty needle some junkie has in a pocket, or cut from a razorblade while searching the individual. These search gloves are so thin of kevlar and leather that you have complete feel to check for small objects, needles contraband, etc in an individuals clothes.
Never underestimate kevlar and its ability to protect you. There are certain things a vest of kevlar will not though, a rifle round will pass through it.
Second chance makes slash resistant vests, Taurus makes far better but bulkier stab resistant vests.
Nothing about the peoples republic of NY suprises me when it comes to their feeble attempts to take away their residents rights and privileges.