Upon receipt of evidence pursuant to an investigation under the Act, each investigation participant who is not a NIST employee shall:

(a) As soon as practicable, transfer the original evidence to NIST, and retain a copy of the evidence only if necessary to carry out their duties under the investigation; and

(b) For any evidence that cannot reasonably be duplicated, retain the evidence in accordance with NIST procedures for preserving evidence as described in § 270.330 of this subpart, and upon completion of the duties for which retention of the evidence is necessary, transfer the evidence to NIST.