French fry logic

From HughHewitt.com: The opinion of Judge John Roberts in the "Case of the consumed french fry:

No one is very happy about the events that led to this litigation. A twelve-year-old girl was arrested, searched, and handcuffed. Her shoelaces were removed, and she was transported in the windowless rear compartment of a police vehicle to a juvenile processing center, where she was booked, fingerprinted, and detained until released to her mother some three hours later - all for eating a single french fry in a Metrorail station. The child was frightened, embarrassed, and crying throughout the ordeal. The district court described the policies that led to her arrest as "foolish," and indeed the policies were changed after those responsible endured the sort of publicity reserved for adults who make young girls cry. The question before us, however, is not whether these policies were a bad idea, but whether they violated the Fourth and Fifth Amendments to the Constitution. Like the district court, we conclude that they did not, and accordingly we affirm.

Emphasis added.

That is what an appeals-court judge is supposed to do.