34 U.S.C. § 60905

(a) Case file review

If a review under subsection (a) case file regarding a cold case murder is conducted and a conclusion is reached not to conduct a full reinvestigation, no additional case file review shall be required to be undertaken under this chapter with respect to that cold case murder for a period of five years, unless there is newly discovered, materially significant evidence. An agency may continue an investigation absent a designated person’s application.

(b) Full reinvestigation

If a full reinvestigation of a cold case murder is completed and a suspect is not identified at its conclusion, no additional case file review or full reinvestigation shall be undertaken with regard to that cold case murder for a period of five years beginning on the date of the conclusion of the reinvestigation, unless there is newly discovered, materially significant evidence.