Offenders got more than token citations in Denver On Oct. 2, 1937, in the somewhat shady Lexington Apartments at 1200 California St. in Denver, Samuel R. Caldwell became the first person in the United States to be arrested on a marijuana charge. Caldwell, a 58-year-old unemployed laborer moonlighting as a dealer, was nailed by the FBI and Denver police for peddling two marijuana cigarettes to one Moses Baca, 26. If you're wondering why it took the U.S. government so long to bust a pot dealer, it's because until the Marijuana Stamp Act was passed - on you guessed it, Oct....