Levies and garnishments: Tough questions

Question: An employee who has child support withheld from his pay declared bankruptcy. We received a bankruptcy order that requires us to withhold $330 monthly. However, the Consumer Credit Protection Act says not more than 50% of an employee’s disposable pay can be withheld for child support. The bankruptcy trustee said that the 50% limit doesn’t apply, but this seems wrong to us. Who’s correct?