Blood Alcohol Content testing

In Birchfield v. North Dakota the Supreme Court held 5-3 that states may criminalize an arrestee’s refusal to take a warrantless breath test. If states criminalize the refusal to take a blood test police must obtain a warrant. The State and Local Legal Center (SLLC) filed an amicus brief arguing that states should be able to criminalize warrantless refusal to consent when a person is arrested upon suspicion of drunken driving.   

The National Conference of State Legislatures reports that 15 states currently criminalize refusal to consent. Criminal penalties typically include fines and jail time.    

All 50 states have adopted implied consent laws requiring motorists as a condition of driving in the state to consent to a blood alcohol content (BAC) test if they are suspected of drunk-driving.

The Supreme Court will decide whether state statutes criminalizing a person’s refusal to take a chemical BAC test where police have not obtained a warrant are unconstitutional. Thirteen states criminalize the refusal to take a warrantless BAC test. 

In Missouri v. McNeely (2013) the Supreme Court held that police generally have to obtain a warrant to conduct a BAC. So the argument goes, it is unconstitutional to criminalize the refusal to take a BAC test if a warrant was required to conduct the test but not obtained.

The three decisions that the Supreme Court has agreed to review all upheld the state statutes.