The only thing I can think of is to mention that "Turn Over Confiscated Contraband" is far from the only assignment that uses the stuff. For some reason some of the Ferasan repeatables use it instead of the asometrics probes their fed counterparts use, for instance. Are you sure you're not unknowingly picking up assignments that use contraband?
You are a peadge. And you are a peadge. Everybody is a peadge!
So much floof.