If an authorised person does something that, apart from this section, would be a Commonwealth offence or an offence under a law of a State or Territory, the person is not criminally responsible for the offence if:
(a) the thing is done in the course of acquiring or using an assumed identity in accordance with an authority; and
(b) the thing is done:
(i) in the case of an authorised intelligence officer, an authorised law enforcement officer or an authorised foreign officer--in the course of his or her duty; or
(ii) in the case of an authorised civilian--in accordance with any direction by his or her supervisor under the authority; and
(c) doing the thing would not be an offence if the assumed identity were the person's real identity.