“They have never been seen. The business with the real estate firms was carried on entirely by correspondence. Inasmuch as postal orders covering the rent were sent by mail, references were not required. You must understand that because of the two shipments held up and confiscated by the French government, we naturally suppose that more of the stuff is being sent over. But we have no actual proof. On the other hand, when we find that several men like Kolinski, who are known to be small fry in this dope racket, suddenly desert their old haunts and become affluent without any visible means of support, we put two and two together. However, we have not been able to trace the source of supply further than I have already told you, nor have we been able to discover their method of distribution.”