From "Reason"
SCOTUS chooses to NOT take cases related to police causing destruction of homes or personal property and not properly reimbursing the affected people.
"Such questions thus continue to 'benefit from further percolation' in the lower courts before this Court chooses to intervene."
Wut?? Five cases from five circuits isn't enough?
Sotomayor answers the Wut?? in her statement, immediately before the part you quote.
"Few of these decisions likewis explain the source of any such police-power exception to the Takings Clause— whether the common law, the Constitution, or elsewhere."
So yep, the justices are complaining that even if there are five cases, they haven't managed to grapple with this core question of law.
Really, this is first a matter for legislative branches, not the judicial branch.
