Attacking what he called racial and ethnic segregation, the Phoenix district attorney filed a federal lawsuit yesterday against Arizona court programs set up to provide treatment for Spanish-speaking and Indian drunken-driving offenders. Andrew P. Thomas, the Maricopa County attorney, whose office serves the fourth-most-populous county in the nation, said the "race-based courts" violated the Constitution and federal laws barring discrimination on the basis of race or ethnicity. The programs are not technically courts. They are probation programs that steer people to therapy and other treatment in an effort to combat alcohol addiction, though a judge may impose jail or other...