The relevant legislation
8The first issue raised in the appeal falls for consideration against the following legislative background.
9The provision, the subject of the charges in the present case, is s 8 of the OH&S Act (now repealed). At the time of the alleged offences it provided:
"8(1) Employees
An employer must ensure the health, safety and welfare at work of all the employees of the employer.
That duty extends (without limitation) to the following:
(a) ensuring that any premises controlled by the employer where the employees work (and the means of access to or exit from the premises) are safe and without risks to health,
(b) ensuring that any plant or substance provided for use by the employees at work is safe and without risks to health when properly used,
(c) ensuring that systems of work and the working environment of the employees are safe and without risks to health,
(d) providing such information, instruction, training and supervision as may be necessary to ensure the employees' health and safety at work,
(e) providing adequate facilities for the welfare of the employees at work.
(2) Others at workplace
An employer must ensure that people (other than the employees of the employer) are not exposed to risks to their health or safety arising from the conduct of the employer's undertaking while they are at the employer's place of work."
10Section 106 of the OH&S Act dealt with the power to institute proceedings for an offence under that Act. It provided as follows:
"106(1) Proceedings for an offence against this Act or the regulations may be instituted only:
(a) with the written consent of a Minister of the Crown, or
(b) with the written consent of an officer prescribed by the regulations, or
(c) by an inspector, or
(d) by the secretary of an industrial organisation of employees any member or members of which are concerned in the matter to which the proceedings relate.
(2) In proceedings for an offence against this Act or the regulations, a consent to institute the proceedings, purporting to have been signed by a Minister or a prescribed officer, is evidence of that consent without proof of the signature of the Minister or prescribed officer."
11The procedure for instituting prosecutions for such offences is to be found in s 246 of the CPA:
"246(1) A prosecutor may apply for an order:
(a) that a person alleged in the application to have committed an offence that may be dealt with summarily by the court must appear at a time and place specified in the order to answer to the offence charged in the order, or
(b) for the apprehension of any such person for the purpose of being brought before a Judge to answer to the offence charged in the order.
(2) The application must be in accordance with the rules.
(3) The order may be made in the absence of one or both parties.
(4) An order for the apprehension of a person may be made whether or not an order has been made under subsection (1)(a).
(5) An order for the apprehension of a person:
(a) must be addressed to all police officers, and
(b) may be addressed to any other person specified in the order, and
(c) may be executed by any police officer or by any person to whom it is addressed at any place at which, had the offence specified in the order been committed at that place, that offence would be triable in the court.
(6) A Judge before whom a person apprehended under an order made under this section is brought may, if bail is not dispensed with or granted, issue a warrant:
(a) committing the person to a correctional centre or other place of security, and
(b) ordering the person to be brought before a court at the date, time and place specified in the order."
12The relevant rule for the purpose of s 246(2) is Pt 53 r 26 of the District Court Rules 1973 (r 26). That rule is in the following terms:
"26(1) Proceedings under section 246 must be commenced in the Court by an application in the approved form for the issue of a summons or for the issue of a warrant for apprehension.
(2) The summons or warrant for apprehension must be in the approved form and must be lodged with the application.
(3) A statement of facts in respect of the offence signed by the prosecutor applying for an order under section 246 is to be lodged with the application.
(4) Where a prosecutor is seeking an order for the apprehension of a person, the application is to be accompanied by an affidavit setting out both the statement of facts and the reasons why a warrant is sought."
13It should be noted that s 3 of the CPA defines "prosecutor" and "rules" as follows:
"prosecutor means the Director of Public Prosecutions or other person who institutes or is responsible for the conduct of a prosecution and includes (where the subject-matter or context allows or requires) an Australian legal practitioner representing the prosecutor."
"rules means rules made for the purposes of a court to which the relevant provision applies."
14The provisions of s 16, s17(2), s 20 and s 21(1) of the CPA are also relevant. These provisions provide as follows:
"16(1) An indictment is not bad, insufficient, void, erroneous or defective on any of the following grounds:
(a) for the improper insertion or omission of the words 'as appears by the record', 'with force and arms', 'against the peace', 'against the form of the statute' or 'feloniously',
(b) for want of an averment of any matter unnecessary to be proved or necessarily implied,
(c) for want of a proper or perfect venue or a proper or formal conclusion,
(d) for want of any additional accused person or for any imperfection relating to any additional accused person,
(e) for want of any statement of the value or price of any matter or thing, or the amount of damage or injury, if such value, price or amount is not of the essence of the offence,
(f) for designating any person by the name of his or her office, or other descriptive appellation, instead of by his or her proper name,
(g) except where time is an essential ingredient, for omitting to state the time at which an offence was committed, for stating the time wrongly or for stating the time imperfectly,
(h) for stating an offence to have been committed on a day subsequent to the finding of the indictment, on an impossible day or on a day that never happened,
(i) if the indictment was signed by an Australian legal practitioner who has been instructed to prosecute the proceedings to which the indictment relates on behalf of the Director of Public Prosecutions-for failure by the Director to authorise the Australian legal practitioner by order in writing under section 126 (2) to sign indictments for and on behalf of the Director.
(2) No objection may be taken, or allowed, to any indictment by which criminal proceedings (including committal proceedings) in the Local Court or for any other offence that is to be dealt with summarily are commenced, or to any warrant issued for the purposes of any such proceedings, on the grounds of:
(a) any alleged defect in it in substance or in form, or
(b) any variance between it and the evidence adduced at the proceedings for the offence charged in the indictment or warrant."
"17(2) The court before which the objection is taken may cause the indictment to be amended and, in that case, the trial is to proceed as if there had been no defect."
"20(1) An indictment may not be amended after it is presented, except by the prosecutor:
(a) with the leave of the court, or
(b) with the consent of the accused.
(2) This section does not affect the powers of the court under section 21.
(3) For the purposes of this section, an amendment of an indictment includes the substitution of an indictment."
"21(1) If of the opinion that an indictment is defective but, having regard to the merits of the case, can be amended without injustice, the court may make such order for the amendment of the indictment as it thinks necessary to meet the circumstances of the case."