A fractured opinion about when the police can draw blood for a warrant after a drunk-driving arrest.

It's hard to know where to start in this new opinion, Missouri v. McNeely:

Sotomayor, J., announced the judgment of the Court and delivered the opinion of the Court with respect to Parts I, II–A, II–B, and IV, in which Scalia, Kennedy, Ginsburg, and Kagan, JJ., joined, and an opinion with respect to Parts II–C and III, in which Scalia, Ginsburg, and Kagan, JJ., joined. Kennedy, J., filed an opinion concurring in part. Roberts, C. J., filed an opinion concurring in part and dissenting in part, in which Breyer and Alito, JJ., joined. Thomas, J., filed a dissenting opinion.

I start with Justice Thomas, who says the natural dissipation of alcohol in the blood is always the "exigent circumstance" that avoids the warrant requirement.  He gives a clear rule.
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