Presumption of Innocence and the Legal Burden

The presumption of innocence and the burden of proof are related but distinct
safeguards. The first establishes the defendant’s legal status before conviction;
the second determines which party must establish the facts necessary for a
conviction.

Together they impose a fundamental constraint on criminal adjudication:
the prosecution must establish guilt rather than
requiring the accused to establish innocence.

Innocence Is Not a Proposition the Defendant Must Prove

Article 6(2) of the European Convention on Human Rights provides that
everyone charged with a criminal offence shall be presumed innocent until
proved guilty according to law.

The principle is not merely a statement about the final verdict. It affects
the structure of the criminal process by limiting the extent to which the
accused may be required to disprove the prosecution case.

In English criminal law, the common-law principle expressed in
Woolmington v Director of Public Prosecutions [1935] AC 462
provides the classic foundation for the prosecution’s burden of proving guilt.

Who Must Prove the Essential Facts?

The legal burden is the obligation to satisfy the tribunal of fact on an issue
according to the applicable standard of proof. In the ordinary criminal case,
the prosecution bears the burden of proving the elements of the offence.

The defendant may raise evidence, challenge the prosecution’s evidence,
provide an alternative account or rely upon a defence. Those actions do not,
by themselves, transfer the prosecution’s ordinary burden of proving guilt.

Parliament may create limited statutory exceptions affecting the burden on
particular issues. Such exceptions are subject to legal safeguards and must
be distinguished from the ordinary rule.

Not Every Evidential Obligation Is a Legal Burden

A critical distinction in criminal evidence law is between the
legal burden and an
evidential burden.

An evidential burden concerns the obligation to raise sufficient evidence
to make an issue properly arguable. It does not necessarily require the
party raising the issue to prove it to the criminal standard.

Confusing these two concepts can produce a serious analytical error:
the fact that a defendant must raise an issue does not automatically mean
that the defendant bears the ultimate burden of proving it.

When the Accused Is Asked to Explain the Prosecution’s Problem

Physical or chronological inconsistencies may create an evidential problem,
but they do not automatically establish a reversal of the burden of proof.
The analytical question is more precise:
who was required to establish the disputed
proposition, and to what standard?

If a prosecution case depends upon a particular physical mechanism, the
prosecution must provide evidence capable of establishing the relevant facts
and inferences required for conviction. The defendant’s inability to provide
an alternative explanation does not, by itself, prove the prosecution’s
explanation.

Conversely, the mere existence of an alternative possibility does not
automatically defeat the prosecution case. The issue remains whether the
prosecution has discharged its legal burden after the evidence as a whole
has been considered.

Testing for Burden Displacement

• What proposition was the prosecution required to prove?
• What evidence was relied upon to establish that proposition?
• Was the defendant required merely to raise an issue, or to prove it?
• Was an evidential burden incorrectly treated as a legal burden?
• Did the reasoning depend upon the defendant’s failure to explain an evidential gap?
• Were the prosecution’s own evidential deficiencies treated as requiring an answer from the accused?
• At the end of the analysis, where did the legal burden remain?

An unsuccessful defence is not necessarily proof of the prosecution case.

The prosecution must establish the elements of the offence independently of
any general expectation that the defendant should be able to explain every
disputed circumstance.

The fact-finder may reject a defendant’s account. That does not, without more,
transfer the prosecution’s burden or convert the rejection of one account into
affirmative proof of every proposition required for conviction.

This page presents an academic framework for analysing criminal proof
and procedural fairness. It does not assess any individual case.