Cities across the United States offered prescription drug collection sites this past weekend as part of the 17th National Prescription Drug Take Back Day,an initiative intended to encourage proper disposal of unused prescription medications. By encouraging people to take part, the Drug Enforcement Administration (DEA) aims to prevent drug addiction and overdose deaths.Since beginning the initiative nine years ago, the DEA has collected nearly 11 million pounds of unused prescription drugs from these Take Back Day events, as the DEA reports in a recent press release.