The pros cannot and should not be expected to have a durometer in their bag, access to a Determinator, an RG Swing, a COR ramp, and a ball sled and a profilometer. They should not have to scientifically test their own equipment.
I agree that what the pros (and retail consumers) really need is trust that the equipment being provided/sold to them is being manufactured to the correct standards. This all falls on the manufacturer and the USBC. If a pro is found to have a non-compliant ball, the pro should go back to the manufacturer and have then make good on it, but the pro should not be penalized by the PBA (other than confiscation of the equipment) for a non-compliance that cannot be seen, heard, or felt.