Related Clues:

• Pen knives?
• Prison weapons
• Switchblades
• Con's blades
• Switchblades, in slang
• Thugs' knives
• Blades behind bars
• Prisoners' contraband, sometimes
• Prison weaponry
• Knives in fights
• Knives, in prison
• Joint blades
• Makeshift knives
• Makeshift blades