Saying no to a warrantless DUI blood test does not necessarily prevent police from asking again. A recent Pennsylvania case allowed a later blood draw where officers calmly explained that they could apply for a warrant and the driver then consented. But police cannot coerce consent simply by repeatedly pressuring or improperly threatening a driver after a refusal. 

On August 21, 2026, the Pennsylvania Superior Court decided Commonwealth v. Eugene Volansky, No. 2204 EDA 2025 (Pa. Super. Aug. 21, 2026), addressing an increasingly important issue: whether police can obtain valid consent to a warrantless DUI blood draw after the defendant has already unequivocally refused.