Just before the Drazi is brought in for the first time (Around 24 minutes), Sheridan's arm restraints appear and disappear as the interrogator sets up for the session.
Sheridan is told he has had "pain givers" installed which would cause an increasingly severe shock the closer he got to the interrogator beginning from a couple feet away, yet several times the interrogator comes within less than a foot of Sheridan with no effect. Evidently, that's how the pain givers work - the victim cannot approach the interrogator, but the interrogator can approach the victim without setting off the givers. Such function can be easily implemented even at the current level of technology. Or the interrogator simply lied.