For the hundreds of thousands of people who enter rehab each year for addictions to drugs, alcohol, sex and other substances and activities, there are literally thousands of facilities that offer counseling and treatment. The quality of these facilities, which includes the experience and knowledge of their staff and the sophistication of their methods, varies widely. This has led several organizations to evaluate and offer accreditation to these facilities, based on various criteria. They are not directly overseen by government agencies, but gain their authority through reputation. Although some government agencies license rehab organizations that provide medical treatment, none actively accredit them.