Cops that I know will purposely carry a junker Chinese knife. You don't want your grail cherry expensive knife to be dipped in blood, guts and dope all day and then carry it home to your family...
Blood guts and dope?
On a knife?
What countries LEO does this?
In the US, LEO uses knives for cutting seatbelts and opening packages, and the occasional weapon retention, so a bad guy doesn't take their gun in struggle, but that's extremely rare.
Most LEO I know carry good quality gear.