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The gaming license issued to Boyd Gaming, Inc., for Delta Downs in Vinton, La., has been declared invalid by a state district court that ruled that the track's former owner, Shawn Scott, had to undergo a suitability check before the license could be granted, since he will be paid based on the performance of a casino at the track. Both Boyd Gaming and the Louisiana Gaming Control Board, which issued the license, will seek to have the decision overturned. . . . William Moorefield, a jockey who spent most of his career on the Maryland circuit, said Tuesday that he has retired because the shoulder he injured last year in a gate accident has not fully recovered despite 12 months in physical rehab. Moorefield, 33, had a record of 307 wins from 2,770 starts and earnings of $3.5 million.