There has been a drastic change under Pennsylvania DUI law as a result of the Birchfield ruling and the implications on implied consent. This blog will address DUI implied consent law after Birchfield. Recently, the United States Supreme Court decided a Fourth Amendment case concerning refusal of blood testing after being pulled over for DUI. Birchfield v. North Dakota, 579 U.S. ____ (2016), DUI what's at stake? holds the government may not criminalize a driver's refusal to submit to a blood test without a warrant. The government still can criminalize a driver's refusal to provide a breath sample without a warrant if the officer has reasonable suspicion to believe a driver is under the influence.