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(a)     is convicted on or after the relevant date of a relevant offence and is sentenced to imprisonment;

(b)     was convicted before the relevant date of a relevant offence, was sentenced to imprisonment and is serving that sentence on or after the relevant date;

(c)     was convicted before the relevant date of a specified relevant offence, was sentenced to imprisonment, is not serving that sentence on that date or at any time after that date but was serving it at any time during the period of five years ending with the day before that date.

(a)     take from the person or require the person to provide him with such relevant physical data as the constable reasonably considers appropriate; and

(b)     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 (6) of section 18 of this Act by the means specified in that paragraph in relation to that sample.