The first phase of drug policy lasted through the 19th century and into the early 20th century. It was characterized by increasing controls on the sale of opium. The 1920 passage of the Dangerous Drugs Act and the Rolleston Committee established by the Ministry of Health in 1926 marked the beginning of the second phase and established what was known as the "British system," in which individual doctors were responsible for deciding how to treat each patient. The medical model of drug issues was replaced in the late 1960's with the reformist model, which focused on rehabilitation and was based on social learning theories. This model united doctors, social workers, and private-sector providers and emphasized the need for a change in lifestyle. However, it is not yet clear whether current discussions of drugs represent a modification of the third phase or the beginning of a distinctly different phase.