Valles Caldera Valles Caldera dates back to the prehistoric times: spear points dating to 11,000 years ago have been discovered. Several Native American tribes frequented the caldera, often seasonally for hunting and for obsidian, used for spear and arrow points. Obsidian from the caldera was traded by tribes across much of the Southwest. Eventually, Spanish and later Mexican settlers as well as the Navajo and other tribes came to the caldera seasonally for grazing with periodic clashes and raids. Later as the United States acquired New Mexico as part of the Treaty of Guadalupe Hidalgo in 1848, the caldera became the backdrop
Drug policy of Sweden allocated to drug work steadily decreased between 1970 and 1975. 1972–75, was a period with much lower police resources for drug-related crimes; the number of police officers dedicated to drug crimes was almost cut to the low level before 1970. In 1976–79, the Prosecutor General recommended that prosecutors lower the limit for drugs which could be ignored as personal use. Tougher prosecution policies were introduced by the chief prosecutor in Stockholm, and resources for drug law enforcement were again increased. From 1971–83, use of illegal drugs among 16-year-old boys fell from about 16% to 5%. In the 1980s and 1990s,