Law enforcers ineffective in thwarting thieves, says local farmer LA GRULLA — A vividly colored watermelon, cut open and abandoned on a narrow trail leading to the Rio Grande, already was attracting a cloud of gnats in the early morning heat. It was all the evidence Javier Perez needed that someone other than his workers was paying attention to his 160 acres of watermelons. Perez, 51, said the visitors usually are Mexicans who float or swim across the river, raiding his land and taking the produce back to Mexico to sell. The problem is not an old one along the...