This is a good read. Matt Harvey is mentioned.
I wish to be clear that I am not trying to backhandedly suggesting something here. You should read the very lengthy article, I am just isolating the Harvey paragraph because Matt Harvey is a notable figure in Mets history.
The Washington Post mentions:
Pitcher Matt Harvey, Skaggs’s teammate, later admitted after being given legal immunity that a few days before the Texas road trip he gave Skaggs several pills marked “K56” containing oxycodone,which was what investigators found in his backpack and his toxicology report. (Harvey declined to comment.) (via WashPo)