Duty to Disclose
A Brady violation occurs even if the state isn’t aware that the evidence exists, such as because the police haven’t turned it over to the prosecutor. The violation doesn’t have to be intentional -- and the defense is under no obligation to ask for the evidence, as the state must disclose it voluntarily. But the defendant must prove that the undisclosed evidence was material to his case -- and that there was a reasonable probability that the outcome of the trial would have been different had the prosecutor disclosed the evidence.
Result of Violations
The results of a Brady violation depend on when it’s discovered. If the information pertains to one of the state’s witnesses, that testimony might be suppressed or barred from the proceedings. If it relates to the defendant and it comes to light after he’s convicted, he can then file a motion with the court asking that the conviction be vacated or erased, or file an appeal to a higher court.
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