The police suffer from the game's overall lack of quality.
The AI is garbage, and stuff despawns as soon as it's out of sight. Which makes most things hard to do properly as you would in a good game.
The cops should spawn OFF THE MAP, and move in towards you (as they're being called in from parts of the city). And you should be able to hide out of sight to lose them (rather than them magically knowing where you are when there's no way for them to find you).
Maybe if they could use some basic AI like the old GTA games have been doing for ages... that would be nice. Hell, Witcher 3 did a better job with guards when you committed crimes. I have no clue how they went this far backwards in their design.They could take inspiration from the running zombies in "Dying Light": when you made too much noise, they came as fast as they could in your last known position, after spawning from a far enough point to still remain immersive.
I have more of an issue with the EXTREME aggressiveness of the NCPD and Tiger Claws.
Get anywhere near either group and they soon open fire on the character. You don't have to do a damn thing, just be to close.
I've seen NCPD and gangbangers right next to each other doing nothing and if you try to attack the gangbangers, the police aggro and attack you.