Criminal Practice in UK Law

Sometimes the words of the section which creates a particular offence make it clear that mens rea is required in one form or another. In such cases there has for centuries been a presumption that Parliament did not intend to make criminals of persons who were in no way blameworthy in what they did. That means that whenever a section is silent as to mens rea there is a presumption that, in order to give effect to the will of Parliament, we must read in words appropriate to require mens rea.

In the first place a stigma still attaches to any person convicted of a truly criminal offence, and the more serious or more disgraceful the offence the greater the stimga. So he would have to consider whether, in a case of this gravity, the public interest really requires that an innocent person should be prevented from proving his innocence in order that fewer guilty men may escape.

Throughout the web of the English Criminal Law one golden thread is always to be seen that it is the duty of the prosecution to prove the prisoner's guilt subject to what I have already said as to the defence of insanity and subject also to any statutory exception. No matter what the charge or where the trial, the principle that the prosecution must prove the guilt of the prisoner is part of the common law of England and no attempt to whittle it down can be entertained.

If the court is to have the power to interfere with the prosecution in the present circumstances it must be because the judiciary accept a responsibility for the maintenance of the rule of law that embraces a willingness to oversee executive action and to refuse to countenance behaviour that threatens either basic human rights or the rule of law.

My Lords, in my opinion, the Judges of the High Court have in their inherent jurisdiction, both in civil and in criminal matters, power (subject of course to any statutory rules) to make and enforce rules of practice in order to ensure that the court's process is used fairly and conveniently by both sides. I consider it to be within this power for the Court to declare that the prosecution must as a general rule join in the same indictment charges that

The Court of Appeal can make its assessment of the fresh evidence it has heard, but save in a clear case it is at a disadvantage in seeking to relate that evidence to the rest of the evidence which the jury heard. For these reasons it will usually be wise for the Court of Appeal, in a case of any difficulty, to test their own provisional view by asking whether the evidence, if given at the trial, might reasonably have affected the decision of the trial jury to convict.

(b) Where however the prosecution evidence is such that its strength or weakness depends on the view to be taken of a witness's reliability, or other matters which are generally speaking within the province of the jury and where on one possible view of the facts there is evidence upon which a jury could properly come to the conclusion that the defendant is guilty, then the Judge should allow the matter to be tried by the jury. (b) Where however the prosecution evidence is such that its strength or weakness depends on the view to be taken of a witness's reliability, or other matters which are generally speaking within the province of the jury and where on one possible view of the facts there is evidence upon which a jury could properly come to the conclusion that the defendant is guilty, then the Judge should allow the matter to be tried by the jury.