Texas, by statute, allows the government to take a person's blood without a search warrant in these situations after a DWI arrest:
The Supreme Court this morning now possibly
calls that statute into question. But for some crazy reason the State in this morning's case didn't argue that there were "exigent circumstances" but instead tried to convince the Court that a blood draw should be legal in
every case. Even the right wingers (except J. Thomas) weren't buying that.
Edit: Some agencies
are already making policy changes to get a warrant and not rely upon Texas' "mandatory blood draw" law.