Mold Remediation, Must be Licensed person?

[William Howley]

Hi, I have a rental property with an outside separated laundry room. There was a leak in the laundry room which caused some mold build up. I have a handyman who says he has mold remediation experience and he knows how to get rid of it. The tenant is insisting I go through a licensed and mold remediation expert. Is it required by law? What are the risks of not going with a licensed person. Any response will help, thanks!