Special to The HighlanderA couple entered a guilty plea on human traf- ficking charges in connection with a north Burnet County counseling center for children, who were allegedly used to further for-profit businesses.In February, co-defendants Gary and Meghann Wiggins pled guilty in the 424th District Court of Burnet County to six counts each of traf- ficking ofpersons, each of which is a second…