New evidence has emerged that Assistant Attorney General Thomas Perez may have improperly prosecuted Wells Fargo, Bank of America and dozens of other banks for lending discrimination by using deficient mortgage data in investigations. IBD has learned the special prosecutor spearheading Perez's record number of statistics-based cases of racism against lenders told federal bank regulators in 2010 he lacked key home loan data needed to conduct the kind of iron-clad "regression analyses" that would hold up in court. Still, Perez's civil-rights division used the shaky data to force bank defendants into a record $600 million in settlements, including loan set-asides...