A local couple received lengthy prison sentences for their part in a meth manufacturing conspiracy.The sentences were handed down in U.S. District Court in Chattanooga.Jacob Barnes was sentenced to serve 12 years and seven months, while Lori Cope received 10 years and seven months. The sentences were issued in federal court meaning they will not get the benefit of early release through parole. Sentences generally run much longer in the federal system than the state system.Their sentences come for their long-term involvement in the manufacture of meth.