zero tolerance
noun/ˌzɪərəʊ ˈtɒlərəns/
/ˌzɪrəʊ ˈtɑːlərəns/
[uncountable]- the policy of applying laws very strictly so that people are punished even for offences that are not very serious
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zero tolerance
Definition of zero tolerance noun from the Oxford Advanced Learner's Dictionary