s 93C Preliminary impairment test
(1) A preliminary impairment test is a procedure under which a service policeman— (a) observes the affected person performing tasks specified by the service policeman; and (b) makes such other observations of the affected person's physical state as the service policeman thinks expedient. (2) A preliminary impairment test may be administered only— (a) at or near the place where the requirement to co-operate with the test is imposed; (b) at a service police establishment determined by the service policeman; or (c) at a medical establishment. (3) The Provost Marshals (acting jointly) must issue, and may from time to time revise, a code of practice about— (a) the kind of task that may be specified for the purposes of a preliminary impairment test; (b) the kind of observation of physical state that may be made in the course of a preliminary impairment test; (c) the way in which a preliminary impairment test should be administered; and (d) the inferences that may be drawn by a service policeman from observations made in the course of a preliminary impairment test. (4) In subsection (3) “ the Provost Marshals ” means— (a) the Provost Marshals of each of the service police forces, and (b) the Provost Marshal for serious crime. (5) A service policeman administering a preliminary impairment test must have regard to the code of practice. (6) A service policeman may administer a preliminary impairment test only if the service policeman is approved for that purpose by a Provost Marshal of a service police force or the Provost Marshal for serious crime . (7) A code of practice under this section may include provision about— (a) the giving of approval under subsection (6); and (b) in particular, the kind of training that a service policeman should have undergone, or the kind of qualification that a service policeman should possess, before being approved under that subsection.