OLATHE, Kan. (AP) — Authorities in a northeast Kansas county are cautioning residents not to be fooled by a scammer posing as a sheriff's employee demanding money. Investigators say someone has been making calls from what appears to be a non-emergency dispatch number of the Johnson County Sheriff's Department. The caller claims to work for the sheriff's department and tells potential victims they'll be arrested on a warrant unless they pay him some money immediately. Master Deputy Tom Erickson says the sheriff's procedure for contacting people facing warrants does not include a demand for immediate payment of a bond. Johnson County is the most populous of Kansas's 105 counties, with an estimated 560,000 residents.