hi guys i'm new here.....i've read something about spawning cop like a bodyguard but i didn't understand the passages to do it..i tried with cheat engine but nothing.....can someone tell me how to do it?
And for curiosity there is also a cheat to play like a cop?i would to say like the console command "roper" or a cheat engine method......thanks.

From this thread - http://www.gog.com/forum/urban_chaos/does_these_cheats_work_for_you

Press [F9] to display the console window. Type bangunsnotgames to enable cheat mode and invincibility, then resume game play. Press one of the following keys during gameplay to activate the corresponding cheat function:

Shift + I spawns Gordansky. She will follow you and automatically attack any foes nearby. If you spawn multiple instances of her, they will start getting in each other's way, causing friendly damage and fighting for real.

yes i have read this topic but i asked about replace gordawsky bodyguard with a cop bodyguard.....(need the use of cheat engine)
and i asked too if it's possible to play like a cop and not like Stern or Roper....

To replace Gordansky, you need to hex edit fallen.exe. This means using a hex editor (you can use anything from this list - http://www.techsupportalert.com/best-free-hex-editor.htm) and opening fallen.exe file in it (make a back-up before doing anything with this file). Then find the byte at 0x14C16 (use search function in editor) and change it from 09 to 02.
Not sure if it's possible to play like a cop, sorry.

ah ok,now it's clear,thanks.