This mod removes the grace time, so you won't get a 0,35 sec invulnerability after you get shot. This will make the difficulty of the game harder.

Note: I only tested it in solo, and on DS. This mod might / might not remove the grace time of other players.

http://modwork.shop/23137 Crackdown cop damage and falloff is recommended

EDIT: 
Dom fixed the mod, so it not overrides the whole difficulty function
I just got that new file from NewPJzuza, and she said that I shouldn't modify the whole function. I uploaded that instead of mine. Also the mod writes the correct name to the mod from BLT mods (silly me, I forgot to change it to the mods name)