1. Alaska opted out in October 2003.
2. California opted out in July 2009.
3. Iowa opted out in December 2001.
4. Idaho opted out in March 2002.
5. Kansas opted out in March 2003.
6. Minnesota opted out in April 2002.
7. Montana opted out in January 2004. Note: The opt-out was briefly reversed in 2005.
8. Nebraska opted out in February 2002.
9. New Hampshire opted out in June 2002.
10. New Mexico opted out in November 2002.
11. North Dakota opted out in October 2003.
12. Oregon opted out in December 2003.
13. South Dakota opted out in March 2005.
14. Washington opted out in October 2003.
15. Wisconsin opted out in June 2005.
Source: American Association of Nurse Anesthetists, last updated July 2009.
