(1) This section applies to covert investigations conducted by a police officer into whether a person other than a person who is in custody following an arrest has been involved in the commission of an offence or suspected offence.
(2) For the purposes of this Part, if the person in custody following an arrest agrees voluntarily to take part in the covert investigation, the person ceases to be under arrest for the offence.
(3) However, subsection (2) does not prevent the person from being rearrested for the offence.