http://www.supremecourt.gov/opinions/12pdf/11-1425_cb8e.pdf
Interesting decision and I wonder what changes it will lead to.JUSTICE SOTOMAYOR delivered the opinion of the Court with respect
to Parts I, II–A, II–B, and IV, concluding that in drunk-driving investigations, the natural dissipation of alcohol in the bloodstream does not constitute an exigency in every case sufficient to justify conducting a blood test without a warrant. Pp. 4–13, 20–23.
...
When officers in drunk-driving investigations can reasonably obtain a warrant before having a blood sample drawn without significantly undermining the efficacy of the
search, the Fourth Amendment mandates that they do so.
. Whether or not there was a collision or someone was injured/in the hospital does not change the way the suspect's body is going to metabolize alcohol. 