What is the current state of the law on nonconsensual blood draws incident to a lawful arrest for driving under the influence?

Prior to McNeely, the rule applicable to nonconsensual warrantless blood draws incident to a lawful arrest for driving under the influence was articulated in Schmerber v. California (1966) 384 U.S. 757 [16 L.Ed.2d 908] (Schmerber). Schmerber upheld a warrantless, forced blood draw during a DUI investigation where the officer was confronted with an emergency making it unfeasible to obtain a warrant before the defendant's blood-alcohol dissipated, and where the blood draw was performed according to accepted medical practices. (Schmerber, at pp. 770-772.)