De Kalb County Drug Investigator 100 S Public Sq Smithville, TN 37166 Phone : (615) 597-4210 Business Category Government Offices-County Legislative Bodies Dekalb County Of--sheriff Drug Investigator 198 S 3rd St Smithville, TN 37166 Phone : (615) 597-4210 Business Category Government Offices-County Private Investigators Private Investigators & Detective Services Detective Guard & Armored Car Services Government Offices & Public Schools