'John' letters target prostitution Warnings come from the mayor By Jeanne Houck Post staff reporter Covington Mayor Irvin "Butch" Callery has been sending out a very different kind of "Dear John" letter for about a year, and he's hopeful it's putting a dent in the prostitution trade in the city. The letters, part of Covington's effort to reshape its once tawdry reputation as a haven for strip clubs and street walkers, are sent by registered mail to the homes of men convicted of soliciting prostitution, saying they are not welcome to practice their vice in the city. Although the mayor...