Answer:
Never release anyone until a trained professional has completed their investigation. Your institution released people who violated policy. This results in them having no reason to cooperate with you on conducting a true internal fraud investigation now. You need to secure a trained investigator to do this inquiry. The problem when you find the person embezzling you may have a lawsuit from the people fired who hadn’t taken the funds.
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Learn more about Barry Thompson’s webinar 20 Internal Fraud Errors to Avoid