The strict policy of enforcing all the laws of a state, or the rules of an institution, and allowing no toleration or compromise for first-time offenders or petty violations
If a government or organization has a policy of zero tolerance of a particular type of behaviour or activity, they will not tolerate it at all. They have a policy of zero tolerance for sexual harassment. The policy or practice of not tolerating undesirable behavior, such as violence or illegal drug use, especially in the automatic imposition of severe penalties for first offenses. 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
extreme intolerance of anti-social behavior (usually by an uncompromising application of the law); "he urged zero tolerance for priests who abuse children sexually