Ed. Note, by Brian Galliford: Thanks to Fam_1st for posting this, apparently in the wee hours of the morning.  It should be noted that this is NOT confirmed - but if true, it's a big hit on a prospect that the Buffalo Bills like (Matthews).

I don't know at all if this is true but I thought it would be interesting to find out more because I don't want to make the mistake and waste a first or second round draft pick on the next Tony Mandarich or Brian Bosworth and have guys who could play in college because they were cheating to improve their physical abilities and then come into the NFL and get themselves torn up.

NFL | Cushing, Matthews tested positive for steroids
Thu, 02 Apr 2009 20:23:40 -0700

Rick Serritella, of NFLDraftBible.com, reports Southern California LB Brian Cushing and LB Clay Matthews tested positive for steroids at the NFL Scouting Combine, according to various sources, including one NFL team.

per KFFL, via NFL Draft Bible