酒驾 and
醉驾 are NOT interchangeable in Chinese law.
酒驾 (blood alcohol 20–80 mg/100ml) is an administrative offense — fines, license suspension.
醉驾 (above 80 mg/100ml) is a criminal offense under
危险驾驶罪, carrying detention and a permanent criminal record. News headlines are careful to use the correct term; mixing them up in legal or formal contexts is a real mistake.
