"Both Willett and police agree that she nodded and put the last bit into her mouth before throwing the wrapper into a trash can."

I think the situation got a little out of hand. Of course, it's always best to be alert in situations like this (due to the ongoing threat of terrorism), but arresting someone for eating a chocolate bar is out of order.

"In 2000, a police officer handcuffed a 12-year-old girl for eating a french fry on a subway platform."

See what I mean? Pathetic. What has eating a french fry got to do with terrorism?