ignorance of law

In law, ignorance is categorized into two types: ignorance of the law (ignorantia juris) and ignorance of fact (ignorantia facti). Generally, ignorance of the law is not a valid defense for criminal charges, as it's considered essential for law administration that individuals are aware of their conduct's criminality. This is often justified by the assumption that serious criminal acts are usually recognized as wrong by reasonable adults.123

However, for statutory offenses involving conduct that isn't obviously immoral or dangerous, some legal systems allow for a defense if the accused made good-faith efforts to understand the law. Ignorance of fact, on the other hand, can be a defense if it negates the required criminal intent, such as mistakenly believing property to be one's own when taking it. In civil matters, ignorance of the law is typically irrelevant, while ignorance of fact may relieve liability or form the basis for recovery.13