Leader of Multi-Million Dollar Mail Fraud Conspiracy Sentenced to Over Nine Years in Federal Prison

A Maryland woman has been sentenced to more than nine years in federal prison for orchestrating a complex check fraud scheme that impacted hundreds of victims and resulted in millions of dollars in losses. Tianna Cosby, 24, of Prince George’s County, led a conspiracy involving stolen and altered checks, identity theft, and money laundering over several months in 2021.

Cosby, who also used the alias “Mendoza,” pleaded guilty in October 2024 to conspiracy to commit mail and bank fraud and aggravated identity theft. According to court documents, she worked with several co-conspirators, including individuals from Suitland, District Heights, Upper Marlboro, and Bowie, Maryland. Together, they stole over 700 checks—many from U.S. Postal Service collection boxes or processing centers—amounting to more than $5 million in face value. These checks were then altered and fraudulently deposited into accounts opened by recruited “account mules.”

The scheme included obtaining stolen checks from the Washington Network Distribution Center in Capitol Heights and leveraging account holders’ identities to carry out financial transactions. Cosby and her co-conspirators used bank accounts under false names to funnel and disguise illicit proceeds. Investigators identified shell businesses, including “Santos Detailing” and “Spectrum Dynamics,” which were used by Cosby to launder the fraudulently obtained money.

During a January 2024 search of Cosby’s residence in Woodbridge, Virginia, law enforcement recovered high-value items purchased with criminal proceeds. This included 27 designer handbags and 14 pieces of jewelry valued at approximately $137,555. A BMW i8 valued at over $114,000 was also seized, containing 151 stolen checks worth more than $610,000. The checks were traced to victims across the country.

Cosby will serve 114 months in federal prison for her role in the conspiracy. The investigation was led by the U.S. Postal Inspection Service, U.S. Postal Service Office of Inspector General, and Prince George’s County Police Department. Multiple Assistant U.S. Attorneys and a paralegal specialist contributed to the prosecution.

Article by multiple RFHC contributors, based upon information from the U.S. Attorney’s Office for the District of Maryland

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