In The Postman Always Rings Twice (1981) the prosecutor initially relies on an insurance company expert who testifies that Frank was hit with a bottle found on the crash scene and so it was not an accident but a planned crime. The said expert is from the company which issued the Cora's killed husband life insurance policy.
Then Frank's attorney finds a person from another insurance company which issued a health and disability policy and brings them two together. They talk for a while, the second company representative promises his company will pay and the next day the expert from the first company says he made a mistake in his testimony and revokes his previous testimony and the prosecutor has no evidence to rely on now and the trial ends.
What's the deal with two insurance companies that the expert changed his testimony?