Are Joint Commission Safety Rules Really Backed by Evidence?

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You have a coffee at the nurses' station, you put it down, and suddenly, someone says, "Hey, the Joint Commission is coming by. Watch out for the Joint Commission on Accreditation of Healthcare Organizations (JCAHO) - put your coffee down over there at that specific table." It's 2 feet away.
The coffee cup on the table rule had me thinking. On midnight rounds, I asked a charge nurse exactly what the Joint Commission looks at.

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TJC has to verify that the hospital is complying with CMS Conditions of Participation PLUS ensure they are complying with TJC's own standards.
Soo if u want to push for a system where every single standard is reached as a result of Evidence base (i.e randomized control trials RCTs), that would have to start with CMS.
But to the larger point, I would have to say that its unrealistic and sometimes unethical to ONLY have standards based on evidence base -RCTs (we can't safely put everything to a randomized control trial). Most of medicine is NOT based on evidence but it is based in rational science.
Lastly, in my experience, TJC provides a better safety system for hospital to run than other available options (DNV, or having CMS come in directly to survey). And TJC does use some evidence/data to create their National Patient Safety Goals (NPSG).