Officer Gapostino was involved in the arrest of Anthony Mason, an African American student, at Wheaton Warrenville South High School in December 2017. Mason alleged that Gapostino used excessive force during the arrest, including placing him in a chokehold and violently twisting his arms behind his back. Mason filed a lawsuit claiming racial discrimination and excessive force. The case was reviewed in May 2021, with the court allowing the equal protection claim against the school’s Dean to proceed, but the outcome regarding Officer Gapostino was not specified in the available information.