Windows :: Law And Order - Justice Is Served Cheat Codes
Locker passwords
Enter "ACE" as a combination to open the victim's locker. Enter "1614" as a password to open the locker belonging to the victim's mother.
Piano lock box
Enter C#, C#, C#, B, C#, D, E, D, C# to unlock the piano lock box in the victim's apartment.
Search for more cheats at CheatCodesClub
Search for more cheats at CheatSearcher

stay in the middle when going through the boxes to get the battery
Take the picture that you found in the victims locker and give them to Rodrigo hell tell you the rest. Good luck with the game.