Many communities now have needle exchange programs, where you can get rid of used syringes and get new, sterile ones for free.

有很多社团提供针头更换项目，可以用旧针管免费换新的，消毒过的针管。

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But Shepherd Smith of Americans for a Sound AIDS-HIV Policy, which opposes needle exchanges, says there are "troubling aspects" to studies that show needle exchange programs work.

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