NASHVILLE (AP) — The Tennessee Bureau of Investigation has served a search warrant seeking information about the operation of the office of Davidson County Clerk John Arriola.

WTVF-TV reported Wednesday that investigators are checking whether there has been a "ghost employee" at the office (http://bit.ly/rUlnQ4).

The investigation was ordered following reports by the station about work arrangements at the office.

The search warrant was executed at a credit union looking for account transactions.