The United States Supreme Court has held that the compelled extraction of blood from a person's body is a Fourth Amendment search. The Court has also held that the government's chemical analysis of blood extracted from a person's body is a Fourth Amendment search.

This case presents the question of whether a Fourth Amendment violation occurs when the government extracts a blood sample by compelled intrusion into a person's body and then chemically analyzes that blood sample for alcohol based upon a warrant authorizing only the extraction of blood, but that does not authorize the chemical analysis of the seized blood.

Whether a Fourth Amendment violation occurs when the government extracts a blood sample by compelled intrusion into a person's body and then chemically analyzes that blood sample for alcohol based upon a warrant authorizing only the blood extraction, but not the chemical analysis