An anonymous reader writes: A Newtown couple, both scientists, who lost their daughter in the school shooting, are wondering whether there were clues in the shooter's physiological makeup — his DNA, his blood, his brain chemistry. They are now involved in a search for biomarkers, similar to those that may indicate disease, for violence. They are raising money to help fund this research, but the effort is running into obstacles, in part, over ethical concerns. "I'm not opposed to research on violence and biomarkers, but I'm concerned about making too big of a leap between biomarkers and violence," said Troy Duster, a researcher at the University of California at Berkeley. There is concern that science may find biomarkers long before society can deal with its implications.