A man in Belgium has been cleared of drunk-driving charges after it was discovered that he hadn’t been drinking. Instead, his own body had produced the alcohol that tripped the breathalyzer test.

The 40-year-old man, whose named was not released by the court in Bruges, was pulled over in April of 2022, reports the New York Times, when he gave a breathalyzer reading of 0.91 mg of alcohol per litre of air exhaled. A month later, another breathalyzer test showed his breath contained 0.71 mg. Belgium’s legal limit is 0.22 mg per litre, which corresponds to a blood alcohol level of 0.5 grams per litre.