On the morning of May 22, 2007, Metzen was arrested for driving under the influence just hours after the 2007 legislative session came to an end. The arrest occurred less than a mile away from his home. During a field sobriety test, he blew a 0.15, which is nearly twice the Minnesota legal limit of 0.08. He wrote a letter of apology for the incident to Senate Majority Leader Larry Pogemiller and his peers. On June 14, 2007, he was sentenced to 20 hours of community service and ordered to pay a $377 fine for the arrest.