It's all thanks to our wonderfully litigious society. Yes, generally speaking, the Good Sam acts do cover people that voluntarily rescue another. That's exactly the problem: voluntarily! What the business owners are afraid of is even appearing to say "yes, go forth and do CPR or Hemlich." By doing that, they're afraid that they're removing the Good Sam protections from their employees (and by extension,themselves) by virtue of directing their employees to provide aid, in effect, those employees are no longer voluntarily providing aid, it's a part of their duties as employees. There is usually some immunity for medical providers, but they're usually going to be specifically listed. Employees whose jobs include first aid but aren't employed in a first aid role aren't covered. See where the problem is and why they're very reluctant to allow employees to provide aid?