Tags: Television Season.
The 20th and final season of Law & Order premiered on NBC on September 25 2009 for which it was moved from its previous time slot to air on Fridays at 8 p.m. ET for the NBC broadcast. L&O was moved to Monday nights on March 1 2010 with a two-hour telecast at 9 p.m. ET before settling into its new time slot at 10 p.m. the following week March 8.During the season The Jay Leno Show in primetime was cancelled and Leno returned to the 11:35 pm Tonight Show because of affiliate dissatisfaction.