"The offence as defined in Part (f) does not select as its criterion the coincidence of intoxicating liquor or the concentration of alcohol at the time the person charged 'drives a motor vehicle or is in charge of a motor vehicle'. Instead, it attaches its consequences to the result of the recording of breath analysis, so long as such analysis was performed in accordance with the Act, on a sample provided by the person within three hours after driving or being in charge of the motor vehicle. The offence enacted by Part (f) is quite different from that enacted by the earlier paragraphs of the sub-section. Whilst it is true that the consequence is to afford to the apprehending officer and the prosecuting authorities discretions the exercise of which has significance for the charge which the accused must meet, that is by no means unique. Ordinarily, at least in cases which do not give rise to a collateral attack on the lawfulness of the exercise of the discretion or to a complaint that its exercise involves an abuse of process affording a ground for relief against prosecution on that charge, courts will not interfere in such decisions. In Mills, the majority expressly reserved the position which would arise if it were shown that the prosecution of the person upon one offence rather than another amounted to an abuse of process. But in this, as in many other cases where the alternative charges are available arising out of the same facts, it is for the police and prosecuting authorities to determine which charges may be brought. If that determination has consequences for the ingredients of the offence which must be proved and the defence is available to the person charged, that affords no reason for assuming that Parliament have meant something different from what it has stated in clear terms."[171] (emphasis mine)