From the American Association for Justice:
The New England Journal of Medicine published a new study on the effects of tort reform on emergency room department treatments. The researchers examined Medicare emergency room fee-for-service claims data from 1997-2011 in Texas, Georgia and South Carolina, all of which changed their emergency care liability standard from negligence to gross negligence. They found that such reforms did not change doctors’ testing behaviors and that "physicians are less motivated by legal risk than they believe themselves to be."
"We did not find evidence that these reforms decreased practice intensity, as measured by the rate of the use of advanced imaging, by the rate of hospital admission, or in two of three cases, by average charges. Although there was a small reduction in charges in one of the three states (Georgia), our results in aggregate suggest that these strongly protective laws caused little (if any) change in practice intensity among physicians caring for Medicare patients in emergency departments."