has not, since the conviction, had a sample, print or impression taken from him; or

has (whether before or after the conviction) had a sample, print or impression taken from him but it was not suitable for the means of analysis for which it was taken or, though suitable, was insufficient (either in quantity or in quality) to enable information to be obtained by that means of analysis.

take from the convicted person fingerprints, palmprints and such other prints and impressions of an external part of the body as the constable reasonably considers it appropriate to take; and

with the authority of an officer of a rank no lower than inspector, take from the person any sample mentioned in any of paragraphs (a) to (d) of subsection (4) of section 28 of this Act by the means specified in that paragraph in relation to that sample.

may require the convicted person to attend a police station for the purposes of subsection (2) above;

may, where the convicted person is in legal custody within the meaning of the 1975 Act, exercise the powers conferred by subsection (2) above in relation to the person in the place where he is for the time being.

in a case to which paragraph (a) of subsection (1) above applies, the period of one month beginning with the date of the conviction;

in a case to which paragraph (b) of that subsection applies, the period of one month beginning with the date on which a constable of the police force which instructed the analysis receives written intimation that the sample, print or impression was unsuitable or, as the case may be, insufficient as mentioned in that paragraph.

shall give the person at least seven days’ notice of the date on which he is required to attend;

may direct him to attend at a specified time of day or between specified times of day.