A Washington law center filed a complaint Wednesday against Chicago Public Schools, saying girls in the district do not receive the same opportunity to participate in sports as boys. The National Women’s Law Center filed complaints against 12 U.S. school districts where district data showed a double-digit gap between the percentage of female students and the percentage of female athletes. According to the complaint, that gap is 33 percentage points in Chicago high schools, the highest among the cited schools. According to the center, that places CPS in violation of Title IX, the 1972 law that prohibits sexual discrimination in federally funded education programs.