(1)Section 18 material must not be used other than -

(a) in the interests of national security,

(b) for the purposes of a terrorist investigation,

(c) for purposes related to the prevention or detection of crime, the investigation of an offence or the conduct of a prosecution, or

(d) for purposes related to the identification of a deceased person or of the person to whom the material relates.

(2) Subject to subsection (1), section 18 material may be checked against other fingerprints, DNA samples or DNA profiles held by a law enforcement authority or the Scottish Police Authority if the responsible officer considers the check to be desirable.

(3) Material which is required by section 18 to be destroyed must not at any time after it is required to be destroyed be used -

(a) in evidence against the person to whom the material relates, or

(b) for the purposes of the investigation of any offence.

(4) In this section -