How the Supreme Court makes a mess of things

The Supreme Court expanded Miranda rights for juveniles in a case this week. There is nothing wrong with that per se. But the vagueness of their decision will cause all sorts of problems for police. Great rather than bright lines, police must now rely on commonsense reality to determine when they are required to give Miranda warnings. The liberal members of the court were joined by Anthony Kennedy in this decision. From the WSJ:

The court ruled in the latest case that police may have to give Miranda warnings to juvenile suspects in some situations where they could question adults without doing so. Although the Miranda decision did not spell out age-based distinctions, "commonsense reality" . . . "A child's age is far 'more than a chronological fact,' " Justice Sotomayor wrote, citing precedents dating to the 1940s. . . .

It would be interesting to see if this decision increase juvenile crime rates.