The NFL suspended Arizona Cardinals wide receiver DeAndre Hopkins on May 2 for six games for violating the league's policy on performance-enhancing substances.
Amid its statement on the matter, the league said Hopkins tested positive for a "prohibited substance plus a diuretic or masking agent/attempt to substitute, dilute or adulterate a specimen/attempt to manipulate a test result."
However, the NFLPA released a statement Tuesday saying that Hopkins "never tested positive for any diuretic or masking agent and there was absolutely no evidence of any attempt to substitute, dilute or adulterate any specimen or any attempt to manipulate a test.