A Griswold man was sentenced on drug charges Wednesday.  47 year old Douglas Dean Bates was sentenced to 180 months imprisonment for Conspiring to Distribute Methamphetamine in and around Cass County.  District Judge John Jarvey also ordered Bates to serve a five year term of supervised release following incarceration. On February 21, 2012, Bates plead guilty to conspiracy to distribute a controlled substance – methamphetamine. The conviction was the result of a three year investigation into methamphetamine trafficking in and around Atlantic, Iowa. At the time of his guilty plea, Bates admitted that from July of 2009, until May of 2010, he agreed to distribute methamphetamine obtained from a South Omaha, Nebraska, source to customers in the Atlantic, Iowa, area.  The investigation was conducted by the Cass County, Iowa, Sheriff’s Office, Audubon County, Iowa, Sheriff’s Office, Cass County, Iowa, County Attorney’s Office and the Iowa Division of Narcotics Enforcement. This case was prosecuted by the United States Attorney’s Office for the Southern District of Iowa.