APNewsBreak: Ex-players: NFL illegally used drugs
DEA probes alleged prescription drug abuse in NFL
Lawsuit: NFL Teams Misuse Drugs, Ignore Players' Health to Gain Profits
Fran Tarkenton: NFL needs to deal with drug problem that goes back to my playing days – Twin Cities
Excerpt on painkillers abuse in NFL from 'The King of Sports' by Gregg Easterbrook - ESPN
DEA probes alleged prescription drug abuse in NFL
Summer - Issue 39 by Football Medicine & Performance Association - Issuu
From The Front Lines: From Painkillers to Heroin
Second wave of former players join NFL lawsuit