The U.S. attorney's office is seeking all records held by the Frankfort Square Park District related to Superdog, including all contracts and agreements connected to the program, all communications between the Park District and Lincoln-Way, all records tied to former Superintendent Lawrence Wyllie's use of Superdog including all records of classes attended, and payments made by Wyllie or his family to the Park District, a copy of the May 10 subpoena shows. The U.S. attorney's office said it was seeking the records "pursuant to an official criminal investigation," according to a May 10 letter attached to the subpoena.