Smart v HM Advocate
Smart v Her Majesty's Advocate is a Scots law case that effectively excludes the common law doctrine of Volenti non fit injuria from Scots criminal law, when concerning assault. The case saw the accused, William Smart, who was charged with assault, lodging the defence that his victim Issac Wilkie has consented to a "square go". Therefore Smart could not be charged with assaulting Wilkie or any injuries arising from the fight. Facts
In 1974, Smart faced trial at Paisley Sheriff Court, where Sheriff McLean and a jury were in charge. Smart put forth a succinct two-part argument. Initially, he asserted that the victim had willingly participated in the fight and comprehended the potential risks, thus challenging the grounds for an assault charge. Additionally, he claimed to have acted in self-defense. Regrettably, this argument was dismissed due to a lack of substantial evidence. The central unresolved issue revolved around whether consent could serve as a defense against an attack. Ruling
The sheriff ruled that:

"Now something has been said about consent. I direct you in law that consent—if you in fact were to find that Wilkie had consented in some way to this assault—then that would not be a defence … if the act is criminal it cannot lose its criminal character because the victim consented, and the reason is not far to seek. " Smart was found guilty of assault by the jury and sentenced to detention for a period of three months. Smart chose to appeal this decision claiming consent was a defence to a charge of assault on the grounds that both men had chosen to fight without weapons in similar conditions to a boxing match. Smart relied on a passage from Gordon, Criminal Law at page 773, which stated:
 
"If A and B decide to fight each other they cannot be guilty of assaulting each other, so long as neither exceeds the degree of violence consented to or permitted by law." The appeal was heard on 24 January 1975 in the High court of justiciary, who on appeal held that it was not a defence to a criminal charge of assault that the injuries had been caused in the course of a consensual fight. The court held that:

"it is in the public interest that it should be decided and made known that consent to a 'square go' is not a defence to a charge of assault based on that agreed combat." The situation was different from indecent acts or injuries caused in the course of organised sports, such as boxing. See also
 Operation Spanner

High Court of Justiciary cases
1975 in United Kingdom case law
1975 in Scotland