question:  Which true statement may have changed Casey's mind if he'd have known?
context: I never thought I'd mess around any of them, but things can sure happen. But—and this was the 'but' that was likely to deprive the System of my activities—even experimenting with them was illegal even if it needed to be done; also, I had promised not to rat on him before taking the job. So there I was, closeted with the ten members of the S.S. Customs Court, getting set to hear the gavel fall and the head man intone the sentence that would take me out of circulation for a long, long time. I'd argued with 'em, but inside I'd been all set for the sentence, and even sort of reconciled to it. "Aw, hell, judge, that's just one of those screwy fairy tales! How could any—" The senior judge rapped ferociously, and I skidded to a halt. We possess well-authenticated photographs of these inhabitants, and if you are prepared to visit them and in some way worm from them the secret of their anti-gravity field, the government stands ready to issue you a full pardon as well as a substantial monetary reward. That whole Kooleen caper: Had it been just a trap to lead me straight to this? Not when I already had more counts against me than a cur has fleas. Well, a cross between a scorpion and a grasshopper, to be accurate. "I just made a pass at the Killicut Emeralds, that's all, and got nabbed." Those emeralds were in the inner shrine of the super-sacred, super-secret temple of the cavern-dwelling tribe of Killicuts on Mars—the real aborigines. Either he was the world's champion liar or its bravest son, and either way I took my hat off to him. My jaw must've been hanging down a foot, because I'd just been playing along with him, not really believing him, and now all of a sudden I somehow knew that he'd really lifted those emeralds.
output:  Pard was working for the S.S.C.
options:  Attaboy was Pard's colorblind friend  The perfume doesn't work  Akroida really loves jewels  Pard was working for the S.S.C.