An RN with a Associate's Degree in psychiatric or mental health nursing must have two years of recent nursing experience, recommended to be within the last 3 years, in an acute treatment unit in a psychiatric hospital, psychiatric home care, a psychiatric Partial Hospitalization Program (PHP), or another out-patient psychiatric service. An RN with a Bachelor's Degree in psychiatric or mental health nursing must have one year of recent nursing experience, recommended to be within the last 3 years, in an acute treatment unit in a psychiatric hospital, psychiatric home care, a psychiatric Partial Hospitalization Program (PHP), or another out-patient psychiatric service.