As he talked, he jabbed a needle through Joel's sleeve into his arm.
Joel jumped. "Damn! What are you up to?" He yanked free, swung angrily on the guard.
"Only a tattoo mark. Isn't visible except under black light. Then it fluoresces green."
"But why?"
"Identification. Shows you're a legitimate maladjustment case and not a government spy."
"But what...."
"No time now. Wait until our man contacts you. Explain everything. Remember, not a word when we reach the cell block!"
He pushed aside the panel at the far end of the hall. The opening revealed a second corridor lined with small iron-barred cubicles. None of them were tenanted.
Joel Hakkyt moved into his own familiar cell where he had been lodged during his trial. The gate clanged shut.
The guard removed his glasses, polished them nervously as he gave Joel a warning look.