sentences:  The Corps murdered William Edgars and captured the only known samples of both the virus and antidote.It was later revealed that, even with the programming removed, Bester had left in place an 'Asimov', a type of mental block - adapted from the first of Isaac Asimov's Three Laws of Robotics (Bester stated that it had been adapted from the first "two" of Asimov's laws, but his explanation only covered the first law) - knowing that Garibaldi would likely murder him on sight if not prevented from doing so.Lyta Alexander eventually agreed to remove the block from Garibaldi's mind, once he had helped her destroy the Psi Corps.