Sufficiency in Criminal Cases: The Moorov Doctrine

Vocabulary flashcards covering the Moorov doctrine, mutual corroboration rules, key appellate case law, time interval principles, and evidential standards in Scots criminal law.

The Moorov Doctrine

An evidential doctrine in Scots criminal law established in Moorov v HM Advocate 1930 JC 68 (also termed mutual corroboration), where separate acts connected in time, character, or circumstance exhibit an underlying unity of intent, project, campaign, or adventure, allowing evidence from separate charges to corroborate each other.

Course of Criminal Conduct Test (MR v HM Advocate 2013)

The requirement that conventional similarities in time, place, and circumstances must demonstrate that individual incidents are component parts of one course of criminal conduct systematically and persistently pursued by the accused, decided as a question of fact and degree.

Propensity Rule (Pringle v McPherson [2010])

The principle that the Moorov doctrine cannot be applied when evidence demonstrates merely a general disposition or propensity to commit a certain type of offence, rather than a single connected course of conduct.

Identification Requirement (Lindsay v HM Advocate 1993)

The evidential rule requiring that the accused must be positively identified by at least one witness on each relevant charge for the Moorov doctrine to apply.

Offences of Different Names Rule (R v HM Advocate 2013)

The full bench decision confirming that charges connected under Moorov do not need to disclose the identical crime, relying instead on judicial understanding of how different illegal acts can be intimately connected.

Non-Physical Assault Corroboration Rule (Duthie v HM Advocate 2021)

The legal rule specifying that non-physical assaults cannot provide mutual corroboration for a charge of rape under the Moorov doctrine.

Historical Three-Year Presumption

The traditional judicial view exemplified in cases like Russell v HM Advocate (a 3.5-year gap held fatal) and Coffey v Houston (a 2-year-and-2-month gap described as comparatively long), suggesting a rough three-year limit for connecting offences via Moorov.

Passage of Time Principle (Dodds v HMA 2002)

The principle that the time between the final incident and the trial is irrelevant to Moorov; only the gap between the offences matters, and crimes of particularly unusual similarity can permit greater time lags.

McAskill Time Gap Approach (McAskill v HM Advocate [2016])

The approach stating that the significance of a substantial interval between offences is evaluated in light of all circumstances; compelling similarities lessen the impact of a time gap when inferring a persisted-in course of conduct.

Grooming Factor (DS v HM Advocate [2017])

An evidential factor indicating that where the similarities between two charges include an element of grooming, a longer time interval between the offences may be legally permissible under Moorov.

Opportunity for Offending Factor (RF v HM Advocate [2016])

The principle that if an accused had available opportunities to reoffend during a substantial time interval between charges and did not take them, this factor weighs against finding a Moorov course of conduct.

Extraordinary Circumstances Test (Duthie v HM Advocate 2021)

A full bench ruling clarifying that lengthy time gaps do not require special, compelling, or extraordinary circumstances as a matter of law, provided similarities in time, character, and circumstances demonstrate component parts of one persistent course of conduct.

Reciprocal Corroboration of Unequal Charges (R v HM Advocate 2013)

The rule abolishing the doctrine from HM Advocate v WB 1969, thereby establishing that perceived less serious criminal conduct can legally provide mutual corroboration for a more serious charge.

Corroboration via Inchoate Offences

The legal rule allowing an attempted crime to corroborate a completed crime under the Moorov doctrine, provided standard Moorov requirements are satisfied.

Jury Function Direction (Sinclair v HM Advocate 1990)

The procedural requirement that a trial judge must determine whether sufficient evidence exists to allow a Moorov inference, but must direct the jury that it is solely their function to decide whether that necessary link has been established.

No Case to Answer Moorov Standard (HM Advocate v SM(2) [2019] / GS v HM Advocate 2024)

The standard establishing that a submission of no case to answer regarding Moorov must only be sustained when it is impossible on any view of the similarities and dissimilarities to conclude the incidents formed a persistent course of conduct.

Non-Sexual Application of Moorov (HM Advocate v McQuade 1951)

The established principle confirming that the operation of the Moorov doctrine is not restricted to sexual crimes and may be applied to non-sexual criminal offences.

Corroboration of the Accused's Implication (HMA v PK 2026)

The principle that corroboration is required for the case against the accused rather than all individual ingredients; where intercourse is admitted or established by DNA, the complainer's evidence of rape requires no further evidence even if consent is disputed.