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What is 'Discovery' in a Criminal Case?

'Discovery' is the disclosure of evidence that will be used against the accused at trial or may be used by the accused to defend themselves.


In Brady v. Maryland, 373 U.S. 83 (1963), the United State Supreme Court held that a criminal defendant has a constitutional right to obtain evidence that is exculpatory in nature. Any evidence that tends to show that the accused did not commit the crime(s) charged, must be disclosed by the Commonwealth. To demonstrate a Brady violation, Appellant must show that: (1) the prosecution concealed evidence; (2) which was either exculpatory evidence or impeachment evidence favorable to him; and (3) he was prejudiced by the concealment. To show prejudice, he must demonstrate a "reasonable probability that, had the evidence been disclosed to the defense, the result of the proceeding would have been different." Com v. R. Simpson, 493 CAP (PA Supreme Court, March 26, 2013).


Rule 573 embodies the requirements of Brady:

What's mandatory on the part of the Commonwealth?

  • Any evidence favorable to the accused that is material either to
    guilt or to punishment, and is within the possession or control of the
    attorney for the Commonwealth;
  • Any written confession or inculpatory statement, or the substance
    of any oral confession or inculpatory statement, and the identity of
    the person to whom the confession or inculpatory statement was made
    that is in the possession or control of the attorney for the
  • The defendant's prior criminal record;
  • The circumstances and results of any identification of the
    defendant by voice, photograph, or in-person identification;
  • Any results or reports of scientific tests, expert opinions, and
    written or recorded reports of polygraph examinations or other physical
    or mental examinations of the defendant that are within the possession
    or control of the attorney for the Commonwealth;
  • Any tangible objects, including documents, photographs,
    fingerprints, or other tangible evidence; and
  • The transcripts and recordings of any electronic surveillance, and
    the authority by which the said transcripts and recordings were

What's Discretionary?

  • The names and addresses of eyewitnesses;
  • All written or recorded statements, and substantially verbatim oral statements, of eyewitnesses the Commonwealth, intends to call atrial;
  • All written and recorded statements, and substantially verbatim
    oral statements, made by co-defendants, and by co-conspirators or
    accomplices, whether such individuals have been charged or not; and
  • Any other evidence specifically identified by the defendant,
    provided the defendant can additionally establish that its disclosure
    would be in the interests of justice.

If you've been accused or charged with a crime in PA, you should consult with a criminal defense attorney as soon as possible. You may contact Shaffer & Engle Law Offices, LLC (717) 268-4287 or email us today.