We find that, in 2006, 29 percent of the workforce was required to hold an occupational license from a government agency, which is a higher percentage than that found in studies that rely on state-level occupational licensing data.

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According to the NHS website, examples of assistant practitioner level roles include occupational therapy assistant, diabetes team assistant and primary care worker in mental health.

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Huge corporations can cope with the myriad rules issued by the Occupational Safety and Health Administration, the Environmental Protection Agency, the Equal Employment Opportunity Commission and their state-level counterparts.

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