From the Honolulu Advertiser, 

The state Department of Health is warning restaurant and food establishment owners to beware of a scam letter alerting them of a requirement to purchase and post signs reminding employees to wash their hands.

Initially I thought this might be the work of a concerned citizen, trying to save the public from the dangers of ill food handlers, but the Hawaiian government believes it to be a credit card scam.

The letter contains an official looking state of Hawaii logo, claims that a new law mandates the display of hand-washing posters and threatens fines for those not in compliance…The DOH has no such requirement for mandatory hand-wash signage, and owners or managers of food establishments should disregard the notice.