National Nurses United (NNU) is pointing to the June 1 shootings of three employees and a patient’s spouse at a Tulsa clinic as further proof of the need for an OSHA workplace violence standard, and is urging the Senate to advance a bill that would mandate a final rule in just a year, cutting short what supporters say is the agency’s unacceptably long rulemaking process. “Yet another tragic mass shooting -- this time at a Tulsa, Okla., hospital -- demonstrates...