Jordan, the third pick in the 2013 NFL draft, did not fail a drug test, but rather submitted a test sample that was diluted, reports Schefter. Diluted samples count as a strike against a player in the league's substance abuse policy.
Jordan was suspended four games last season for a violation of the league's performance enhancing substances policy.
Jordan has appeared in 26 games over his two seasons, recording 46 tackles, three sacks and three pass deflections.
Jordan's suspension creates a position of need for the Dolphins, who hold the 14th pick in the NFL draft, which begins Thursday in Chicago.