When MPC was seized  to be used as evidence in criminal proceedings, it was cancelled. This made the evidence worthless in commerce and eliminated the problems that would result from a conversion. The stamp says "NOT NEGOTIABLE/CID EVIDENCE". Slight variations in the stamp have been seen and the notes have been found both with and without initials. At least two colors of stamp ink have also been seen. CID is the Army's Criminal Investigation Division.

  Cancelled evidence certificates were not seen in the collectors' market until 1995, when some were found among notes brought in from Vietnam. Since that time they have gained acceptance by collectors. All of the dollar denominations have been found but none of the fractional notes. One military police Vietnam veteran reports that normally MPs did not bother marking the fractional denominations.