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Costner and Baldwin were ordered by U.S. District Judge Martin Feldman to attend each day of the trial, which they heeded. The judge thanked them at the end of the trial.

“I know that being here throughout the trial has been a great challenge for them,” Feldman said.

Costner testified that he never saw Baldwin contribute anything to their company’s efforts to persuade BP to use the centrifuges. Baldwin testified that no one asked him to invest any capital or lobby BP but said he used his celebrity to market and promote the centrifuges while he also worked on a documentary about the nation’s worst offshore oil spill.

Costner had lost $20 million in an earlier effort to market the devices to the oil and gas industry, but Cobb said Costner and Smith each made $15 million off their investments in Ocean Therapy Solutions after the BP spill.

BP deployed a few of the centrifuges on a barge in June 2010. The company capped the well the following month, and it was permanently sealed in September 2010.

Costner praised the jury for “doing their best to understand everything” in a complex case.

“They were really smart, and it was my good luck that they saw the truth of the story,” he said.