Where two expert witnesses had previously examined video footage for tampering and found none, the U.S. District Court properly denied request for third expert witness.The 7th U.S. Circuit Court of Appeals affirmed a decision by U.S. District Judge Milton I. Shadur.In 2010, the Chicago Police Department and the Federal Bureau of Investigations conducted a joint operation to investigate and arrest individuals involved in drug trafficking on the city’s West Side. As part of the investigation, both agencies obtained …