If you have stayed in any state in the US for more than 6 months, you need police clearance* (if over the age of 18) from the state(s) and the FBI. (Police clearance as well as FBI clearance are valid for 6 months) The link below, is a list of all US State Police Departments, addresses, phone numbers and their individual requirements in PDF format, however, cannot absolutely guarantee the accuracy of the information. They may change without notice.
List of websites with state police certificatesFor pdf files, you will need the Adobe Acrobat Reader (version 3.0 or later), available at no charge from Adobe's web site, to view and print this file.
Forms:
Arkansas | doc file