When Burma was separated from India in 1937, the production and distribution of opium in the trans-Salween area became an important issue for the British since the Government of Burma would be expected to adhere to the various international agreements to control the opium trade. Initiatives by British officials in London to tighten restrictions were necessary since this region produced over and above the licit requirements of opium for the Shan States, but they were never fully implemented owing to resistance from local authorities and traders and the lack of any alternative cash crop to substitute for opium.