Chicago Police Supt. Eddie Johnson has a busy West Side district under the command of a cop with a long history of misconduct allegations, a WBEZ analysis of police records shows. Cmdr. James Sanchez has been a subject of at least 90 formal complaints since joining the force in 1985, according to the records, obtained through the Illinois Freedom of Information Act. Most of those complaints alleged excessive force or improper searches. Sanchez, who was promoted by Johnson to commander last August, has nearly twice as many complaints as any of the department’s other 21 district commanders — and about five times their average.