P knows of perjured testimony - P has a heavy burden to show that the testimony was harmless beyond a reasonable doubt. If reasonable likelihood of prejudice than the conviction is reversed 2. D does not have the unrestricted right to examine evidence in order to have a better prepared case. Compulsory process is not necessarily violated because D did not examine evidence. Material evidence must be disclosed.
Court can do an In Camera review of evidence and determine if it is material.
Evidence was lost or destroyed - D must show bad faith and what evidence would have shown 4.