Thomas,
Several thoughts:
1 - CheckSystems is considered a consumer reporting agency and so the authority to call CheckSystems on anyone is governed by FCRA.
2 - FCRA does not require signed authorization to obtain a consumer report. You are authorized to pull it if you have a "legitimate business need" in connection with "a business transaction initiated by the consumer". You clearly have met this requirement if a customer comes to you to open a deposit account.
3 - Here's where I get a little fuzzy. I think up until recently, you could assume that an applicant was acting as agent for a joint applicant. This is consistent with HMDA, for example, which allows one applicant to complete government monitoring information for the other applicant.
However, with the advent of ECOA's requirements to demonstrate intent on the part of each applicant to apply for credit, I think that assumption is shifting. To my knowledge, there have not been any official pronouncements about whether you must have demonstrated intent from the individual before you obtain a consumer report, but it seems that that thinking would be consistent with Reg. B as it now stands.
However, the FTC's Statement of Policy does address the question of obtaining a consumer report on an applicant's spouse. I'm also a little fuzzy on this because I know the FTC's statements of policy pre-date the 1997 (I think) changes to the act and so are somewhat suspect. However, they are still there and this is what they say about the applicant's spouse:
5. Information on an Applicant's Spouse
A. Permissible purpose. A creditor may request any information concerning an applicant's spouse if that spouse will be permitted to use the account or will be contractually liable upon the account , or the applicant is relying on the spouse's income as a basis for repayment of the credit requested. A creditor may request any information concerning an applicant's spouse if (1) the state law doctrine of necessaries applies to the transaction, or (2) the applicant resides in a community property state, or (3) the property upon which the applicant is relying as a basis for repayment of the credit requested is located in such a state, or (4) the applicant is acting as the agent of the nonapplicant spouse .
I think either of the sections I bolded above could give you authorization, but I'd love to hear from others how they view this situation.
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Opinions are mine and not necessarily my employer's.