The U.S. government issued a formal apology to the Mayfield family, which reads as follows:

"The United States of America apologizes to Mr. Brandon Mayfield and his family for the suffering caused by the FBI's misidentification of Mr. Mayfield's fingerprint and the resulting investigation of Mr. Mayfield, including his arrest as a material witness in connection with the 2004 Madrid train bombings and the execution of search warrants and other court orders in the Mayfield family home and in Mr. Mayfield's law office.

The United States acknowledges that the investigation and arrest were deeply upsetting to Mr. Mayfield, to Mrs. Mayfield, and to their three young children, and the United States regrets that it mistakenly linked Mr. Mayfield to this terrorist attack. The FBI has implemented a number of measures in an effort to ensure that what happened to Mr. Mayfield and the Mayfield family does not happen again."