Neoheroin was an illicit drug that was illegal in the Federation.

E. D. Fitzgerald visited an Orion space-port and witnessed the unloading of 75 tons of neoheroin, though this quite legal under local regulations, though he was not told where it was going. He also saw a Human disguised as a Rigellian apparently attempting to steal some, though the thief was disabled when his nose-filters became clogged, and customs officers arrested him. They expected to interrogate him for his associates, if he survived (FASA RPG module: The Orions: Book of Common Knowledge).