Two people who spent months behind bars before their sentences for conspiring to sell synthetic marijuana were overturned will not be going back to prison.U.S. District Judge Robert W. Gettleman last week resentenced Ruby Mohsin and Mohammad Khan to time served.Gettleman also ordered Mohsin to serve two years of supervised release.Gettleman rejected the argument that the pair should face enhanced sentences for disregarding the dangers posed by the misbranded drugs — synthetic marijuana labeled as incense or potpourri …