Ethicists Disagree On Experimenting During CrisesThe federal government is undertaking the most ambitious set of studies ever mounted under a controversial arrangement that allows researchers to conduct some kinds of medical experiments without first getting patients' permission. The $50 million, five-year project, which will involve more than 20,000 patients in 11 sites in the United States and Canada, is designed to improve treatment after car accidents, shootings, cardiac arrest and other emergencies. The three studies, organizers say, offer an unprecedented opportunity to find better ways to resuscitate people whose hearts suddenly stop, to stabilize patients who go into shock and...