起訴便宜主義きそべんぎしゅぎ法律principle of opportunityprinciple of discretionary prosecution (the right of a public prosecutor to exercise discretion in cancelling prosecution)
起訴法定主義きそほうていしゅぎ法律principle of compulsory prosecution (i.e. a public prosecutor must seek an indictment if evidence is sufficient)
事情変更の原則じじょうへんこうのげんそく法律clausula rebus sic stantibus (legal principle that agreements become non-binding if there is a major, unforeseeable change of circumstances)