LOWELL, Mass. — A former Lowell police officer has been sentenced to two years in jail for using his badge to extort sexual favors from prostitutes.Aravanh Lakmany of Dracut pleaded guilty Wednesday in Lowell Superior Court to charges of extortion by threat and three counts of solicitation of prostitutes.The Middlesex district attorney's office dropped three counts of rape against Lakmany.The Sun (http://bit.ly/ZuZJae ) reports that in addition to the jail sentence, a judge gave him three years of probation.,