Ethics in business can be a slippery slope. If minor or occasional ethical lapses by employees are tolerated, either openly or by looking the other way, there's no telling where the situation will end up. That makes it essential to deal with such problems immediately. However, smacking down a direct report for a minor transgression can be counterproductive. By all means confront the individual as soon as possible. In order to soften the blow but to make sure it's effective, offer understanding without letting that be an excuse. Allow the individual to offer their own explanation to blow off steam. But make it clear that the ethical lapse is unacceptable and not to be repeated.
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