CASA = gutless - if they are so concerned then issue an interim determination/order/directive. But to throw it back on an employer to potentially stand down an employee whose medical is still valid shows CASA up for what it is.
Have CASA sent employers the details of this latest research upon which they (employers) are encouraged to make an informed medical related decision but for which they would have no expertise. FFS, isn't that why we go to a DAME and have a Medical Branch in CASA.
I doubt ANY employer will take someone off-line for the reason Waren9 mentions.