In late July, President Obama signed a bill requiring some form of labeling of foods containing genetically engineered materials. The measure preempts state laws, like Vermont’s, that require different labels than those mandated by the federal measure. The law requires companies to disclose any genetically engineered materials, but does not require them to disclose that fact on the label or product itself. Rather, if companies choose, they can simply put a bar code or QR code that consumers could scan with a smartphone to retrieve the relevant information. Smaller companies would be allowed to include only a phone number that consumers could call to learn whether their food is genetically engineered. The call-me-later approach to food labeling is more than a bit unusual. But might it actually be right? Read more analysis from me and Steve Ansolabahere over at Forbes.