(1) A document may not be retained by virtue of section 1 for more than 48 hours without further authorisation.
(2) A constable of at least the rank of chief inspector may authorise the retention of the document for a further period or periods if satisfied that -
(a) the examination of the document is being carried out expeditiously, and
(b) it is necessary to continue the examination for the purpose of ascertaining whether the document is one that may be seized.
(3) This does not permit the retention of a document after the end of the period of 96 hours beginning with the time when it was removed for examination.