Give a stream of consciousness and then the final answer. Context: Law & Order: Special Victims Unit, an American police procedural television series, premiered on September 20, 1999 on NBC. Created by Dick Wolf, it is the first spin-off of Law & Order and follows the detectives of a fictionalized version of the New York City Police Department's Special Victims Unit, which investigates sexually based offenses. SVU originally aired on Monday nights at 9pm / 8c EST, but it was moved to Friday nights at 10pm / 9c after the ninth episode. Showrunner Robert Palm felt too disturbed by the subject matter and left after the season's conclusion.\n\nQuestion: when did the first episode of law and order svu air?
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To answer this question, we should know that: Law & Order: Special Victims Unit, an American police procedural television series, premiered on September 20, 1999 on NBC.
So, the final answer is September 20 , 1999.
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