Three devices made to alert drivers to children left behind in a car seat were unreliable on their own, casting serious doubts on their ability to prevent deaths related to heatstroke, a study backed by U.S. auto safety regulators showed this week. The study is part of a national campaign by the National Highway Traffic Safety Administration to raise awareness about heatstroke, which is the leading cause of non-crash vehicle-related deaths of children under the age of 14, the agency said.
