Brennan, J. expressed a somewhat similar view[34]. But it is of fundamental importance to appreciate that their Honours' remarks occur in judgments concerned with offences which were statutory and of which negligence was not an element. Moreover, Dawson, J. "readily admit[ted] that there [was] an element of rationalization" in his explanation of the operation of the "defence" in relation to statutory offences. The passage from his Honour's judgment has been referred to in a number of subsequent cases, but the only relevant discussion of substance is the judgment of Abadee, J. (with whom Carruthers, J. and, with qualifications, Badgery-Parker, J. agreed) in the New South Wales Court of Criminal Appeal in Australian Iron & Steel Pty. Ltd. v. Environment Protection Authority[35]. The case was not cited to us by counsel. Abadee, J. held that there was no defence of "due diligence" to a prosecution for polluting waters under the Clean Waters Act 1970 (N.S.W.), a statutory offence, and in the course of doing so criticised the judgment of Dickson, J. (as he then was) in Sault Ste. Marie. He agreed[36] with a submission that the High Court had not accepted that the defence of honest and reasonable mistake of fact entailed the absence of fault or the absence of negligence. For this he cited the passage in Dawson, J.'s judgment in He Kaw Teh, saying that Dawson, J. was rejecting the concept that an absence of negligence was an appropriate description of mistake of fact in Australia. Abadee, J. also referred[37] to a statement in Jiminez[38] to the effect that the defence of honest and reasonable mistake made it unnecessary to introduce fault as an element of the offence under consideration. Here, however, gross negligence or gross fault is an element of the offence of manslaughter by criminal negligence, and for the reasons I have earlier given it seems to me inescapable that the "defence" of honest and reasonable mistake of fact entails the absence of negligence and that the presence of negligence denies the reasonableness of any relevant mistake. The two cannot co-exist.