A Northampton man pleaded guilty last week to giving a 15-year-old girl drugs and alcohol in exchange for sex, the Northwestern District Attorney’s Office announced Monday. On May 14, 36-year-old Corey Griswold pleaded guilty to four counts of rape and abuse of a child and two counts of sex trafficking of a minor. He also pleaded guilty to single counts of enticement of a minor to engage in prostitution, enticement of a child under 16, exhibitin…