The Supreme Court has the greatest luxury of picking and choosing to decide among all the cases it receives. If the high Court picks your case, it has been granted certiorari ("cert" for short). It takes four justices to grant a case cert. Usually, a frustratingly cryptic list is issued of cases granted and denied cert, with nary an explanation of how and why a case ended up on one list rather than the other. But yesterday, we saw an unusually detailed statement from Justice Sotomayor explaining (and disagreeing) with the Court's denial of cert in a criminal case. Maybe more justices will begin doing this sort of thing, although I suspect they will save it for when they truly disagree with a cert denial.
h/t Glen Greenwald