Tom Clancy's Splinter Cell: Chaos Theory HD

Go near a scanner and use your EEV to hack it from a distance. There is 1 retinal scanner in each of the following missions:

3. Bank – Across from the sleeping guard after climbing down the rope.
5. Displace – Near where a guard sits at his desk and opposite the door to the gym-like area.
7. Battery – After taking the lift up you should see a guard and camera to your right and the scanner straight ahead on the right side of a door.
10. Kokubo Shosho – After taking the escalator down, go right down some small steps to find the scanner on the left side of a wall.