Maricopa County Sheriff Joe Arpaio will appeal a federal judge’s ruling that his agency systematically singled out Latinos in its trademark immigration patrols, marking the first finding by a court that the agency racially profiles people.

Tim Casey, the lead attorney representing America’s self-proclaimed toughest sheriff in the case, said an appeal of the finding that the agency racially profiles people was planned in the next 30 days.

The decision by U.S. District Judge Murray Snow in Phoenix backs up years of allegations from Arpaio’s critics who say his officers violate the constitutional rights of Latinos in relying on race in their immigration enforcement.

Snow, whose ruling came more than eight months after a seven-day, non-jury trial, also ruled Arpaio’s deputies unreasonably prolonged the detentions of people who were pulled over.