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Law and Order, created by Dick Wolf, has been on the air since 1990. The first half of each show is about the police investigation of a crime, the second half involves the DA's office and the prosecution of that crime. The cast of the show has changed often. The current cast includes Sam Waterston, Jerry Orbach, Jesse L. Martin, S. Epatha Merkerson, Dianne Wiest and Angie Harmon. It airs on Wednesday nights on NBC.