A January 25, 2006 article in The Union Democrat newspaper reported some interesting statistics on missing persons in the state of California:
1. Of the 40,685 adults reported missing statewide in 2004, nearly 83 percent of them left voluntarily, according to the California Department of Justice.
2. In Calaveras County during the same year, 20 of the 43 missing adults left voluntarily, according to the department.
3. In Tuolumne County, 65 of 90 missing adults disappeared on their own, the department said.
You can read the entire article @ Experts: Many disappear on purpose.