DATE ON TONIGHT’S INVESTIGATION. THE FBI HAS STEPPED IN TO INVESTIGATE A SUSPICIOUS LETTER THAT HAD POWDER INSIDE OF IT. INSIDE UPMC MERCY HOSPITAL. NOW, IT WAS DETERMINED THAT POWDER WAS FLOUR, BUT ...

MCMINN COUNTY, Tenn. — Authorities in McMinn County said they're working to determine whether a powdery substance that students at E.K. Baker Elementary School contained "cocaine, xylazine, and ...