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Luther Davis, the subject of a Yahoo! Sports investigation over alleged impermissible benefits given to players at three SEC schools, has been denied certification through the NFL Players Association, according to a source.

NFLPA claims Davis, a former Alabama defensive end, directly or indirectly solicited a player for representation as a contract advisor, according to a source. Davis is appealing the ruling. 

Davis reportedly acted as an intermediary between agents and financial advisors and SEC players, most notably former Alabama left tackle D.J. Fluker. Players from Tennessee and Mississippi State also were linked to benefits in the report, though the NCAA has cleared the Bulldogs in the case.

Multiple transactions tied Fluker to Davis during his eligibility, Yahoo! reported, including hotel stays, furniture and airline flight. Some of those transactions occurred in Alabama, possibly violating state agent laws.

The NCAA's attempts to interview Fluker, now a tackle with the San Diego Chargers, have been unsuccessful, according to a source close to Fluker.

Alabama hired a law firm to internally investigate the matter and has banned Davis from association with the program.