The DOJ is charged with having them.https://www.law.cornell.edu/wex/brady_rule
The Brady rule, named after
Brady v. Maryland, requires
prosecutors to disclose
material,
exculpatory information in the government's possession to the defense.
Brady material, or the evidence the prosecutor is required to disclose under this rule, includes any information favorable to the accused which may reduce a
defendant's potential sentence, go against the credibility of an
unfavorable witness, or otherwise allow a
jury to infer against the defendant’s guilt.
Initially, the Brady rule was only applicable if the defendant made a pretrial request for specific information which the prosecution denied. In
United States v. Bagley, however, the
Supreme Court eliminated this request requirement and stated that the prosecution has a constitutional duty to disclose all material, favorable information in their possession to defendants regardless of whether it is requested.
This duty is breached regardless of whether that information is withheld intentionally or unintentionally.