This is a phone scam that specifically targets restaurants, so if you own or work in a restaurant be sure to keep an eye out for it. Depending on your state the health inspector will have different standards and things which they check for. One thing is universal though, a bad rating from the health inspector can mean the end of your business.
Continue reading here: https://www.callersmart.com/articles/165/health-inspector-phone-scam-overview