(BOWLING GREEN)--  A Saint Louis man who admitted to a Pike County drug charge has been sentenced to eight years in prison. 37-year-old Billy Ray Williams pleaded guilty to a felony charge of trafficking in drugs. 26 -year-old Marie Johnson of Bowling Green was arrested with Williams on January 24th after the two met with a confidential informant in Frankford.    Johnson recently pleaded guilty to possession of a controlled substance and was put on five years of probation.