Nurses and doctors seeking professional licenses in Colorado would have to pass fingerprint-based criminal background checks — a requirement in most states — under a proposal backed by state regulators. The Department of Regulatory Agencies is pushing for the change. Rep. Janet Buckner, a Democrat from Aurora, is the primary sponsor of the legislation the state agency is backing. “These expanded background checks would be part of initial licensure, licensure by renewal, endorsement, reinstatement of a license, and when a licensee is the subject of a board investigation,” said Lee Rasizer, spokesman for DORA’s Division of Professions and Occupation. The legislation would affect doctors, nurses, dentists, optometrists, podiatrists and veterinarians.