How Has This Pesticide Not Been Banned? Opinion.

The New York Times
Government scientists say chlorpyrifos is unsafe. And yet it’s still in use. Details here.

A "crop-duster" sprays a pesticide believed to be chlorpyrifos
on a canola crop in Manitoba. Circa 2006. A PinP photo.

A related story that may interest you:

Thirteen years after the pesticide chlorpyrifos (Lorsban) sickened a Manitoba family, Health Canada is proposing it be severely restricted in Canada. The European Union will ban it in the new year. 
by Larry Powell