CDC scientist: tests needed on gas drilling impact

PITTSBURGH — One of the government's top scientists says much more research is needed to determine the possible impacts of shale gas drilling on human health and the environment.

"Studies should include all the ways people can be exposed, such as through air, water, soil, plants and animals," Dr. Christopher Portier wrote to The Associated Press in an email.

Portier is director of the National Center for Environmental Health at the federal Centers for Disease Control and Prevention in Atlanta.

WSJ.com