How do I open Tucker's safe?

Hint 1 of 9:

The safe operate by voice recognition.

Hint 2 of 9:

You need to find something with Tucker's voice on it.

Hint 3 of 9:

There's a laserdisc in the desk of the high security area of the supervisor's
office that has his voice on it.

Hint 4 of 9:

Now all you need is the equipment to play that disc.

Hint 5 of 9:

There's a TV in the R&D office, on the desk just in front of Paul Dubois's.