Sch 2A para 9
(1) A constable may require a person to attend a police station for the purpose of taking a non-intimate sample from him under section 63(3ZA). (2) The power under sub-paragraph (1) above may not be exercised in a case falling within section 63(3ZA)(b)(i) or (ii) (sample taken on a previous occasion not suitable etc ) after the end of the period of six months beginning with the day on which the appropriate officer was informed of the matters specified in section 63(3ZA)(b)(i) or (ii). (3) In sub-paragraph (2) above, “ appropriate officer ” means the officer investigating the offence for which the person was arrested. (4) The power under sub-paragraph (1) above may not be exercised in a case falling within section 63(3ZA)(b)(iii) (sample, and any DNA profile, destroyed where investigation interrupted) after the end of the period of six months beginning with the day on which the investigation was resumed.