That for the purpose of the conduct by a police officer of an investigation into an offence that has been committed or that the Commissioner believes to have committed, the use of a listening device is necessary; or That an offence is about to be, or is reasonably likely to be, committed and that, for the purpose of enabling a police officer to obtain evidence of the commission of the offence or the identity of the offender, the use of a listening device is necessary.
b) Permettre à un officier de police d'obtenir des preuves sur la commission d'une infraction ou sur l'identité du coupable, lorsqu'une infraction est sur le point d'être commise ou que l'on a des raisons légitimes de penser qu'elle va l'être.