Fisher Police Dept. has been investigating and conducting surveillance at multiple locations in Fishers for “the last several months,” according to a news release. An investigation was made at Relax Spa, 7245 Fishers Landing Dr., July 23. Rui Qing Xie, 56, was arrested and booked on prostitution after agreeing to perform a sex act for money with an undercover police officer. FPD spokesman officer Tom Weger said this was the third prostitution arrest since January.