Where a financial institution has any doubt about the authenticity, validity or completeness of a client's identification data obtained earlier, it shall have the client's identity distinguished anew.

金融机构对先前获得的客户身份资料的真实性、有效性或者完整性有疑问的，应当重新识别客户身份。

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But in most states, the gun dealer who stands to profit from a gun sale, rather than a law enforcement agency, determines the authenticity of purchasers' identification cards.

CNN: Mass murder and powerful firearms