There are two main types of law: public law and private law. Public law deals with government powers and obligations and includes criminal law, administrative law, and constitutional law. Private law regulates relationships between individuals and includes contract law, tort law, and property law. A landmark tort law case was Donoghue v Stevenson in 1932, which established that manufacturers have a duty of care toward consumers. Criminal cases involve a prosecutor and defendant, with the prosecutor bearing the burden of proof beyond reasonable doubt. Civil cases involve disputes between plaintiffs and defendants, where plaintiffs must prove their case on the balance of probabilities. Various legal professionals play roles in court proceedings, such as judges, solicitors, barristers, and witnesses.