Bester states in his briefing that the telepaths have stolen an "unknown" number of PPGs. As they were stolen from a military armory, they should have an inventory on file, and therefor know how many are missing.
At the beginning as Bester says "Since then they've divided into two groups", his mouth movements don't match his voice.
Byron confiscated the ID's of all of his people, so why wouldn't he take the weapons too?
Bester tells Garibaldi that he has programmed two of Asimov's laws into his psyche. But what he states, that Garibaldi cannot harm Bester, or through inaction allow him to be harmed, is a variation on only one of the Laws of Robotics, the First one.