I laugh at those "Employees Must Wash Hands' signs in rest rooms.
This is like expecting Stop Signs to actually stop cars. Since many people (not typing canines) these days seem to have difficulty in obeying "the rules" of good public behavior, perhaps Employee Identification Cards with electronic doohickeys or thingamajigs (hey, I'm a dog) that log whether an employee has actually put his hands under running water in the sink (not the toilet, see previous parenthetical aside) could be developed and installed.
Nanny State, rather that Fanny State. (Hey, couldn't resist that one)
Please forgive typos. Dewclaws need clipping.