One possible case that matches your description is the case of marijuana doctor identity theft in Missouri. According to https://www.marijuanadoctors.com/blog/missouri-medical-marijuana/, over 600 patients submitted a letter with a false signature of a physician to obtain medical marijuana certification. The office of Medical Marijuana Regulation discovered the fraud and notified the affected patients.

Another possible source of information is https://www.law.cornell.edu/uscode/text/18/1001, which is a federal law that prohibits making any materially false, fictitious, or fraudulent statement or representation in any matter within the jurisdiction of the executive, legislative, or judicial branch of the United States.

A third possible source of information is https://www.findlaw.com/smallbusiness/business-laws-and-regulations/fraudulent-misrepresentation.html, which explains the elements and remedies of fraudulent misrepresentation in contract law.
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