The problem might come as prescreening - if it morphs into where the LO looks at a credit report, informs the customer that they would be wasting their time applying (or whatever the polite terminology is) and there is no application or other record (such as Adverse Action Notice). There is no real way to control the situation if the potential applicant comes in with a credit report and asks the LO if they would qualify. It would be a rather large fair lending issue though.
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Integrity. With it, nothing else matters. Without it, nothing else matters.