NASHVILLE, Tenn. -

The Tennessee Bureau of Investigation is participating in an initiative Saturday sponsored by the Drug Enforcement Administration.     

The National Prescription Drug Take-Back Day is a free event for individuals who have accumulated expired, unused or unwanted prescription medications.     

From 10 a.m. to 2 p.m., the medications can be dropped off for safe disposal at the TBI headquarters, 901 R.S. Gass Boulevard in Nashville.  

During five previous drop-off events, officials say 2 million pounds of prescription medication were taken out of circulation nationally.