Amends GS 90-113.21(a), excluding injection equipment, as the title indicates. Makes conforming changes to GS 90-113.22(a) and GS 90-113.23(a). Enacts new GS 90-113.25 (Use, possession, manufacture, or delivery of injection equipment not unlawful), as the title indicates. Applies to acts committed on or after December 1, 2013.