Statutory framework
6The circumstances in which the prosecution arose may be briefly stated. The Club, as its name indicates, is a registered club operating premises at Blacktown in western Sydney. It provided an area, known as the Western Terrace, in which patrons could smoke. There were poker machines in the area. The area was, again as the name suggested, a terrace which formed part of the Club's premises, facing the rear and positioned, in part, over the loading dock, to which access was to be had from Flushcombe Road, Blacktown. Above the terrace were the upper storeys of the building; it was in effect an irregular oblong area with interior walls of the building forming three sides and the open area facing the rear of the building covered by a mesh security screen.
7Section 7 of the Act makes it an offence for any person to smoke in a smoke-free area. Section 8 then provides:
" 8 Occupier not to allow smoking in smoke-free area
(1) If a person smokes in a smoke-free area in contravention of section 7, the occupier of the smoke-free area is guilty of an offence."
8The Club accepted that it was an occupier and that people smoked within the Western Terrace. Indeed, it was established for that very purpose. In broad terms, the question for resolution was whether the Western Terrace was a "smoke-free area". The Act defined that concept in s 6:
" 6 Smoke-free area
(1) In this Act, smoke-free area means any enclosed public place, but does not include an exempt area."
9The Western Terrace was not an exempt area. Examples of places, the whole or any part of which, could constitute a smoke-free area were provided in Schedule 1 to the Act. Clubs were listed in the schedule. It was not in dispute that the Western Terrace was part of the Club and that it was a "public place", being a place to which a section of the public had access and which it was entitled to use. The critical question was whether it was an "enclosed public place". The Act defined "enclosed" in s 4:
" 4 Definitions
In this Act:
...
enclosed , in relation to a public place, means having a ceiling or roof and, except for doors and passageways, completely or substantially enclosed, whether permanently or temporarily."
10On one view, the prosecution might have proceeded by asking whether the Western Terrace was "completely or substantially enclosed", within the terms of the definition in s 4. That did not happen. Instead reliance was placed on "guidelines" made pursuant to the power conferred on the Governor to make regulations not inconsistent with the Act. The relevant subject was identified in s 23(2)(e) in unusual terms:
" 23 Regulations
...
(2) In particular, the regulations may make provision for or with respect to the following:
...
(e) guidelines in relation to determining what is an enclosed public place and when a covered outside area is considered to be substantially enclosed for the purposes of this Act ...."
11At the date of the alleged offence, the 2007 Regulation included cl 6, which had a predecessor in similar terms, but which itself commenced on 1 September 2007. (Clause 6 has since been amended, but only in respect of locked-open doors or windows, which are not presently relevant.) Thus, as in force at the time of the alleged offence, cl 6 provided:
" 6 Guidelines for determining what places are enclosed
(1) The provisions of this clause prescribe guidelines in relation to determining what is an enclosed public place and when a covered outside area is considered to be substantially enclosed for the purposes of the Act.
(2) A public place is considered to be substantially enclosed if the total area of the ceiling and wall surfaces (the total actual enclosed area ) of the public place is more than 75 per cent of its total notional ceiling and wall area.
(3) The total notional ceiling and wall area is the sum of:
(a) what would be the total area of the wall surfaces if:
(i) the walls were continuous (any existing gap in the walls being filled by a surface of the minimum area required for that purpose), and
(ii) the walls were of a uniform height equal to the lowest height of the ceiling, and
(b) what would be the floor area of the space within the walls if the walls were continuous as referred to in paragraph (a).
(4) The following are to be included as part of the total actual enclosed area:
(a) any gap in a wall or ceiling that does not open directly to the outside,
(b) any door, window or moveable structure that is, or is part of, a ceiling or wall, regardless of whether the door, window or structure is open (other than the area of any locked-open door or window),
(c) the area of any locked-open doors or windows, but only that part of the total area of all such doors and windows that exceeds 15 per cent of the total notional ceiling and wall area.
(5) A gap in a wall or ceiling that opens directly to the outside (other than a gap caused by a door, window or moveable structure being open) is not to be included as part of the total actual enclosed area.
(6) A gap, door, window or moveable structure required to be included as part of the total actual enclosed area is to be included as if the wall or ceiling were continuous and the gap, or the space occupied by the door, window or moveable structure, were filled by a surface of the minimum area required for that purpose.
(7) In this clause:
ceiling includes a roof or any structure or device (whether fixed or moveable) that prevents or impedes upward airflow.
locked-open door or locked-open window means a door or window that opens directly to the outside and is locked fully open (that is, secured in its fully open position by means of a key operated lock).
moveable structure includes a retractable awning, umbrella or any other moveable structure or device.
wall includes any structure or device (whether fixed or moveable) that prevents or impedes lateral airflow."
12In opening the appeal, senior counsel for the Club identified what he described as common ground between the parties, namely that the prosecution was run on the basis that the guidelines contained in cl 6 of the Regulation were prescriptive, exhaustive and valid. That description encompassed two propositions. First, the inter-relationship of cl 6 and the Act need not be addressed. Secondly, if the prosecutor failed to establish that, in respect of the Western Terrace, the criterion identified in sub-cl 6(2) was not satisfied, the charge should be dismissed.
13The case for the Club in this Court was that the area covered by the mesh security screen did not constitute a "wall"; that was so because the mesh did not "impede lateral airflow" for the purposes of the definition of "wall" in cl 6(7). That conclusion rested on a factual finding of the magistrate that there was no discernible diminution in airflow through the screen, sufficient to constitute impeding airflow: Local Court judgment, at [21]. If the areas covered by the mesh security screen did not constitute "wall surfaces" for the purposes of sub-cl 6(2), the Western Terrace was not "substantially enclosed" and, therefore, the charge was properly dismissed.
14In order to understand the position of the prosecutor fully, it will be necessary to explain the context in which the present appeal came to be decided. However, the short response of the prosecutor to the submission noted above was that the definition of "wall" did not involve any qualification in respect of the impedance to lateral airflow, by terms such as "significant". Once some level of impedance was established, the definition was satisfied.
15The prosecutor adopted an alternative approach, in the event that the mesh security screen was held not to be a "wall". She submitted that the area covered by the screen constituted a "gap" in a wall for the purposes of sub-cl 6(4)(a). If, as she further submitted, the gap did not "open directly to the outside" then the area was nevertheless to be included in calculating the total actual enclosed area, with the result that the Western Terrace was "substantially enclosed" for the purposes of sub-cl 6(2). Because the Western Terrace opened on to a covered area at the rear of the building which constituted either a walkway to the rear of the building or the roofed cavern created by the entry to the loading dock, it could not be said that the Western Terrace opened directly to the outside.
16The Club's response to the alternative argument also had two parts. It contended that the total absence of a wall along the rear of the Western Terrace did not constitute a "gap in a wall" for the purposes of sub-cl 4(a). Secondly, the Club argued that even if that were wrong and the rear of the Western Terrace did constitute a "gap in a wall", it nevertheless opened upon a cavern which was directly connected to the outside air, without any intervening structure, and was properly described as opening "directly to the outside".
17This simplified statement of the issues was complicated by the time the matter reached this Court in a way which requires reference to the proceedings in the Local Court and in the Common Law Division.