Arrested for eating a candy bar

A US Govt Scientist was arrested in Wash. DC for eating a candy bar.

This is a strange. Apparently, eating is prohibited in the subway station, so as the scientist was going down the escalator towards the station, a police officer told her to finish the candy bar before entering the station. Both of them agree she nodded, put the last bit into her mouth, threw the wrapper in a trash can, and then entered the station. But she was still arrested. Why? Apparently, because she hadn’t completely swallowed it.