Cross your heart and hope to die
The most advanced and efficient form of interrogation system short of a roomful of sensors and an airhypo full of sodium pentathol, the R-101 is a portable thanks to it's briefcase-style configuration. Many Arasaka corporate police pack these in their patrol vehicles. The R-101, when opened, unfolds into a multi-display screen, a laser-light optical scanner, a head brace, a pulse, and a blood flow reading wristwrap, and a palm scanner. The subject must have their head in the brace so their eye can be scanned for dilation and other telltale signs while their hand rests on the scanner plate while their blood flow and heart rate is monitored. An audio processor checks voice stress, and the entire unit uses a (deliberately) noisy processor as it's CPU for obvious reasons.