This is used throughout the Half-Life 2 chapter Point Insertion and works best with stunsticks.
The gordon_precriminal global state makes all npc_metropolice neutral to the player and citizens, pushing the player away when they get too close and chasing them when provoked. npc_combine_s is usually used for the Combine's actual military force. Npc_metropolice uses a small arsenal of weapons and little tactical judgement, designed for the first few levels of Half-Life 2 and its authoritarian atmosphere. They serve as City 17's primary police force and are one of the most basic Combine enemies.
Npc_metropolice is a point entity available in the Half-Life 2 series.
