I needed to dispose of some prescription medicine. After a search online, I learned that all Metro substations will accept medications. Since I needed to be near Ann Road for a volunteer project today, I decided to stop on my way home.
I went to the window to sign in and when the woman went to help me, she showed me a green machine in the southeast corner of the building. You empty the bottles into a mailbox kind of opening. No bottles or caps go with the medication.
In a brief time, I was on my way out. The woman waved to me as I left. Very convenient way of disposing medications no longer needed. I don't think it's necessary to sign in if all you're doing is what I did today.