 What did Casey probably learn from this experience?
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. That whole Kooleen caper: Had it been just a trap to lead me straight to this? Well, a cross between a scorpion and a grasshopper, to be accurate. After all, in the pen a man can eat and breathe, and a guard won't reach in and nip off an arm or leg while he's got his back turned. "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.
 Never trust a crook
 Never give up on your friends  Never trust a crook  Always listen carefully to instructions  Don't judge others by how they look