CARTERSVILLE, Ga. -- Authorities arrested a man after they found more than 40 kilos -- that's almost 90 pounds -- of drugs in his car during a traffic stop. 

According to the Bartow County Sheriff's Department, Miguel Angel Valencia was pulled over during a traffic stop on I-75 near Cartersville back in March. 

Deputies said they searched Valencia's vehicle and found the kilos of drugs hidden inside several 5-gallon buckets.

Agents initially thought the drug was cocaine, but they took samples and tested it at the Georgia Bureau of Investigation Crime Lab, where it tested positive for fentanyl. The drug is listed as a synthetic opioid used to treat pain, but is 50 to 100 times more potent than morphine.

After the investigation, Drug Task Force agents concluded it was one the largest fentanyl busts in Georgia and one of the largest in the nation. 

Valencia was arrested is being held in the Bartow County Jail awaiting a Superior Court bond hearing.

Read more from NBC Atlanta -- 11 Alive News (WXIA).