To be clear: someone wrote you a personal check and you asked for their driver's license and social security number.
This person gave you their social security number, and then you discovered that another customer also uses this social security number.
So, if you have their name and full social security number, you can verify it with this service:
If you believe that either of these people is involved with identity theft, you are advised to report this information to the police. Such activities are subject to criminal prosecution.
For example, every person who, with the intent to defraud, acquires, transfers, or retains possession of personal identifying information of another person, is guilty of a crime punishable by up to $1,000 and one year in county jail. California Penal Code § 530.5 The use of personal information for unlawful purposes is a misdemeanor / felony "wobbler."
The ID theft victim also has the right to bring action against anyone claiming a right to money or property in connection with a transaction procured through ID theft. California Civil Code § 1798.93
Click here for the Federal penalties for identity theft.
Also, please note that it is illegal to run a credit report on an individual without their written consent.
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Disclaimer: Any information given by me is for informational use only and is not legal advice. This is general information and is not intended to be specifically tailored to an individual. I strive to provide quality information, but I make no claims, promises or guarantees about the accuracy, completeness, or adequacy of the information contained in or linked herein and its associated sites. Persons accessing this response are encouraged to seek legal counsel in their jurisdiction for accurate guidance regarding their individual circumstances.