Blackmon’s suspension didn’t result from DUI guilty plea

It’s known that Jaguars receiver Justin Blackmon will serve a four-game suspension to start the season for violation of the league’s substance-abuse policy.  It’s not known what he specifically did to cause the suspension. It’s safe to say that the suspension did not flow from Blackmon’s 2012 guilty plea to DUI.  Even though Blackmon’s blood-alcohol…