I thought they handed out free needles to keep down the spread of needle-borne diseases.
But then i've never seen an addict or homeless person with a sharps container turning it in for replacement needles. (I've been told my insulin needles could bring $2 on the open market, and the person telling me that offered to broker the exchange for 40%. You hear strange stuff at the VA Hospital* - especially when your voice recorder is in playback mode.)
stay safe.
* - once a quarter I bring a 2-liter soda bottle, all sealed with tape, to the lab. They handle disposal without needing to shake anything out of the bottle.