You know you will not be able to beat LCPD:FR 1.0

LCPDFR + realistic mods FTW (and Hardcore enabled of course)

LCPDFR! With Version 1.0, it's a class of its own. Granted, I have used both mods, but LCPDFR always was the one I preffered. 

IM Going to be a cop when im older so trust me LCPDFR

LCPDFR. 

 ( LCPDFR )  hands down

I've had loads of trouble with PPM in the past, although it was the first police mod I saw and that's what got me into GTA IV for PC. After a while, I saw a few of NB's videos and immediately went to LCPDFR after PPM was terrible.

Life story.

Install LCPDFR, open the police computer and go to the searching thing, type PPM. Logout, ignore the error, drive to the marker. If nothing happens, aim at the person. This, I think, was supposed to be removed from the script but wasn't (hence the reason it doesn't really work right). Anyway, that's PPM.