What is Red 40 and why hasn't the FDA banned the dye?

The FDA's top food official says the safety of the dye called Red 40 hasn't been assessed in over a decade, despite concerns over its potential behavioral health effects.

What is Red 40 and why hasn't the FDA banned the dye?
The FDA's top food official says the safety of the dye called Red 40 hasn't been assessed in over a decade, despite concerns over its potential behavioral health effects.