What is the key legal concept in determining guilt in criminal cases?

The principle of "innocent until proven guilty," also known as the presumption of innocence, is a foundational concept in criminal law. This means that an individual is considered innocent until there is sufficient evidence presented to establish their guilt beyond a reasonable doubt. This legal standard is crucial as it protects the rights of the accused and ensures that the prosecution must meet a high burden of proof.

By adhering to this principle, the legal system aims to prevent wrongful convictions and maintain justice. It places the responsibility on the prosecution to prove the defendant's guilt rather than requiring the defendant to prove their innocence. This concept is vital for maintaining fairness in the judicial process and upholding individual rights within the legal framework.