The United States Supreme Court held today in the case of Missouri v. McNeely that the natural dissipation of alcohol by the body did not justify a blood draw without a warrant under the Fourth Amendment. As a , the Court decision to take a case-by-case approach is consistent with the protections of the Fourth Amendment and will ensure that officers make some efforts to obtain a warrant, leaving for the trial court the decision of whether the circumstances in any particular case rose to the level of exigent circumstances to excuse the warrant requirement.
In this case, the police officer took the defendant to the hospital to obtain a blood draw after the defendant indicated that he would refuse a breath test. The defendant’s breath test results were .154 and were excluded from evidence by the trial court and Missouri Supreme Court. The State appealed to the United States Supreme Court. You can read the decision of the United States Supreme Court by clicking on this link. .
The State argued that because the body eliminates alcohol over time that this creates an exigent circumstances that eliminates the need for a warrant under the exigent circumstances exception to the warrant requirement. The United States Supreme Court rejected this argument, for the following reasons: