Denver district attorney spokeswoman Lynn Kimbrough tells the Denver Post a criminal probe has been launched into the allegations. Colorado's Independent Ethics Commission is also investigating.
Gessler's spokesman, Rich Coolidge, says the office fund is similar to the per diem given state lawmakers where no receipts are necessary.
Gessler is also under fire for using state funds to return early from the Republican National Convention in Tampa, Fla. Colorado's elections chief says death threats were made against his family, prompting his early return.
(Copyright 2012 by The Associated Press. All Rights Reserved.)