A microphone that transmits to separate recording equipment is a 'listening device' under s 3(1) of the Listening Devices Act 1984 (NSW), even though it cannot record by itself (majority, Hulme J and Adams J; Giles JA dissenting). A person who carries a microphone for their own purposes of obtaining a recording is not a 'mere carrier' and 'uses' the device within s 5(1)(b). The proper question under the s 5(3)(b)(i) defence is whether recording the conversation was reasonably necessary, not whether having the conversation was necessary (Adams J; Giles JA and Hulme J held the contrary finding was open). The split on the definition question and the defence question leaves some uncertainty.
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