Brady Material: Evidence that tends to mitigate or negate a defendant's guilt as to the offense charged. The Brady rule, named after Brady v.Maryland, requires prosecutors to disclose material, exculpatory information in the government's possession to the defense. Rule 3.220 - DISCOVERY (a) Notice of Discovery. A Brady motion is a defendant's request that the prosecution in a California criminal case turns over any potentially "exculpatory" evidence. Discovery is a pretrial process where both the prosecution and the defense exchange information about their respective cases. Request violates due process where the evidence is material either to guilt or to punishment, irrespective of the good faith or bad faith of the prosecution. Has a model policy on Brady disclosure requirements, but the policy is only available to IAPC members. " Brady is a rule of disclosure, not of discovery. Testimony that was not disclosed in the government's pre-trial disclosure letter.