SOUTH PADRE ISLAND — The early morning sky brightened to a slate blue, providing Luis Sosa with just the right camouflage. Sosa, a state game warden, steered a 65-foot boat over open water at the southern tip of Texas.

Sosa and three fellow game wardens from the Texas Parks and Wildlife Department watched the horizon and the radar screen aboard the boat, the Captain Williams. They were looking for signs of the Mexican fishing boats they had seen the day before, operating illegally in Texas waters......

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