(1) This chapter is not intended to affect any other law of this State that authorises, controls or monitors the conduct of activities—(a) that are for the purpose of obtaining evidence that may lead to the prosecution of a person for an offence; and(b) that involve, or may involve, conduct for which participants in the operation would otherwise be criminally responsible.
(2) Also, this chapter is not intended to affect the investigation of minor matters or investigative activities that, by their nature, can not be planned but involve the participation of police officers in activities that may be unlawful.
(3) Subject to subsections (1) and (2) , a controlled activity may be approved only under this chapter.