The New York State Nurses Association is making a big push for “safe staffing” — mandatory nurse to patient ratios in every hospital. In Albany, it’s backing legislation. In New York City, members are negotiating with New York Presbyterian, Montefiore, and Mount Sinai — and threatening to go on strike if ratios aren’t put in place. But as Camille Petersen finds, not everyone in the world of healthcare agrees ratios are a good idea.