The FBI has subpoenaed the Dallas Independent School District's credit card records from the past two-and-a-half years.
The subpoena issued last week asks for all records and documents relating to credit card use beginning in January 2004.
Meanwhile, the district continues its own investigation into possible credit card abuse. The district has hired former US attorney Paul Coggins to head the internal probe, and he says the district's working with the FBI to provide the documents.
The FBI began investigating possible corruption within the district last summer after The Dallas Morning News reported on relationships between district officials and vendors. That including a school official's use of a fishing boat owned by executives of the district's largest computer supplier.
Superintendent Michael Hinojosa canceled the district's credit card program earlier this month in response to reports of wasteful spending and lax oversight of the program.