New York Attorney General Eric Schneiderman sent a letter to several banks on Friday advising them to limit tellers' access to customer data and do more to detect signs of misbehavior, according to a story in The Wall Street Journal.

The AG's office has been investigating tellers for stealing customer data and money, an unnamed source said.

The AG sent the letter to Bank of America, JPMorgan Chase, Wells Fargo, Citigroup, Banco Santander, Capital One Financial, HSBC, PNC Financial Services Group and TD Bank.

In one high-dollar recent case, a group of tellers and outside accomplices stole $850,000 using customers' stolen personal data. 

Nadia Figueroa, 24, of the Bronx, was sentenced last month to two to six years in state prison. 

Figueroa pleaded guilty in February to stealing customer data while employed as a JPMorgan Chase bank teller in White Plains, N.Y. She was part of an identity theft ring, operating between July 2010 and June 2014, that stole more than $850,000 by using bank tellers to obtain the personal information of hundreds of customers. The ring then created fake identification cards to withdraw money from accounts.

Figueroa was charged with Grand Larceny, a third degree felony. Her role in the scheme involving using her position as a bank teller to target customers with common names and more than $50,000 in their accounts. She would copy customer data including account numbers and Social Security numbers and hand it over to her co-conspirators who used it to create fraudulent checks and identification documents.  

Figueroa and her co-conspirators victimized customers at JPMorgan Chase bank branches, as well as branches for Bank of America, HSBC and Wachovia. She is scheduled to start her prison term in May. 

The scheme’s ringleader, Tyrone "Reese" Lee, and another defendant, Anthony “Sug” Davis pleaded guilty in January. Lee was sentenced to 4.5 to 9 years in prison. Davis received a term of 2 to 6 years. Davis also was recently sentenced to 10 years in prison in a separate federal identify theft case. The participants in the scheme were charged in September.

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