Okay. Anyhow, yes, there can be three levels of action.
The employee may be demoted/terminated once this is found out.
If the employer wants to, the employee may be sued for the money that they used for personal use on the credit card.
If the employer wants to, the employer can file a criminal complaint. The employee may then be liable criminally and may face criminal charges of embezzlement/theft. However without knowing more (what actually happened, how much was spent, what state this is in), it is hard to say exactly what kind of criminal charges he may be facing.
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