The reg is not about tying the loan back to an MLO. It is about MLO disclosing their qualifications to a consumer so that consumer can make an informed decision about who they want workin gon their mortgage loan. The act states that the unique identifier needs to be disclosed before acting as an MLO, upon request, or in the first written communication. SAFE does NOT require that number to be on loan docs (that's coming down the road under Dodd-Frank--rules have not been written yet). All registered MLOs who touch the loan need to give out their unique identifier. From an operation standpoint on loan docs, I would put the number of the officer of record on the loan docs (if you are doing that). BUT make sure that all MLOs acting as MLOs on that loan are disclosing their number (it's as easy as giving out their business card with their number written on it).
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I can't herd the cats anymore, so I just set up the electric fences and let them fry when they stray out of bounds.