The law allows law enforcement to seek search warrants for a blood sample if a person arrested for driving under the influence refuses to consent to one
The Supreme Court is considering whether police need to get a warrant before ordering a blood test on a suspected drunk driver.
Wednesday, U.S. Supreme Court justices heard the case of a Missouri man pulled over for suspected DUI in 2010 and forced to undergo a blood test.
The American Civil Liberties Union claims that without a search warrant, the blood test violated the man's fourth amendment right against unreasonable search and seizure.
Lawyers for Missouri and the Obama administration argue police should be allowed to administer a blood test without a warrant, because a person's blood alcohol level drops as the body processes it and authorities must get a reading as quickly as possible.
A ruling is expected later this year.