Some useful codes
Here are some codes you might find useful. I've beaten the game 2 and 1/2 times (on easy,normal, and I'm working on hard) and the codes have been the same all 3 times
Anyway... Episode 1
Part 3: 9-3-8 for the locker in the lounge area.
Pt. 5: 5-8-4 Freeman's code for the safe in his office (behind the painting) and the hand scanner.
Ep. 3
Pt. 1: 6-9-4 code for the safe, which holds Hidden evidence.
Ep. 4
Pt. 2: 5-4-1 for the health tent
Ep. 5
Pt. 1/2: 4-1-5 for a secret corridor.
Hope it helps!
More tricks, tips and cheats for this game are right here - Syphon Filter: Dark Mirror cheats
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