24 Second, the provisions of the Corrections Act and Corrections Regulations do not support the proposition that strip searches conducted on the basis of positive ion scan readings serve 'no law enforcement or other legitimate purpose'. The Governor of a prison is responsible for the management, security and good order of the prison.[7] For that purpose unauthorised substances, which include drugs of dependence, are prohibited.[8] A person who wishes to enter or remain in a prison may be required to submit to a formal search.[9] An ion scan is a search to detect the presence of drugs and is a formal search as contemplated by s 44(2) of the Corrections Act. The ion scan is conducted specifically to ensure that unauthorised substances such as drugs of dependence are not brought into the prison, and more generally for the management, security and good order of the prison. For that same general purpose the Governor of a prison may, in addition to the ion scan, require a visitor to submit to a search and examination of the visitor's person.[10] Common sense and the scheme of the Corrections Act suggest that an ion scan reading which positively indicates the presence of an unauthorised substance on a visitor is a matter which would properly be taken into account by a Governor of a prison when considering whether or not to require, in addition to the ion scan search, that the visitor submit to a strip search. This conclusion is reinforced by reg 71(6) which provides that a strip search may be conducted immediately after a scanning search. The applicant relies on the acknowledgement in Commissioner's Requirement 1.2.5 that a positive ion scan is not an absolute indication that the person scanned has in his or her possession an unauthorised substance to support a submission that a positive ion scan reading does not justify proceeding to require a strip search. There is no merit in that submission. If a positive ion scan was an absolute indication that a visitor to a prison had an unauthorised substance in his or her possession, there would be no need for a strip search. The scan result would justify the Governor in prohibiting that visitor from entering or remaining in the prison. Because the positive ion scan does not give an absolute indication, but does raise the possibility of possession by the visitor of an unauthorised substance, the Governor has the option of requiring a strip search. In those circumstances the Governor might properly require a strip search for the security or good order of the prison.