According to the testimony of General Ryukichi Tanaka before the International Military Tribunal of the Far East during his post in Manchuria the revenue derived from the opium and other narcotics traffic became the chief source of revenue income for the Manchukuo government.
Menurut kesaksian Ryukichi Tanaka di hadapan Pengadilan Militer Internasional di Timur Jauh pendapatan yang berasal dari opium dan lalu lintas narkotika lainnya menjadi sumber utama pendapatan pendapatan bagi pemerintah Manchukuo.