Pubdate: Sat, 30 Jan 1999 Date: 01/30/1999 Source: Economist, The (UK) Author: Edward Miller SIR-America's criminalisation of marijuana began in the 1930s when DuPont's chemists developed petrochemical cellophane and nylon while perfecting the sulphate-sulphite process to make cheap paper from wood pulp. William Randolph Hearst was then busy investing millions in timber in both America and Mexico. The only competition came from hemp, a crop requiring scant water and no pesticides. Newspaper pulp manufactured from hemp required no toxic sulphites and offered more pulp per acre than trees. It was also a cheap base for commercial plastics. The two industrial giants conspired and eventually wiped out America's commercial hemp. Hearst geared up his newspaper empire to criminalise hemp while DuPont's lobbying in Washington helped establish the Federal Bureau of Narcotics in 1930. The then secretary of the treasury, Andrew Mellon, was also DuPont's lawyer. In August 1937 President Roosevelt dealt commercial hemp a fatal blow by signing the Marijuana Tax Act. EDWARD MILLER San Rafael, California