zero tolerance
From Longman Dictionary of Contemporary Englishzero toleranceˌzero ˈtolerance noun [uncountable] a way of dealing with crime in which every person who breaks the law, even in a very small way, is punished as severely as possible a policy of zero tolerance in inner-city areasExamples from the Corpuszero tolerance• But if the speeds aren't going to be cut by zero tolerance, even they would find it hard to support.• The school board has a policy of zero tolerance for students caught with drugs.• This zero tolerance for disease has led to a zero tolerance for animals.