Major League Baseball is investigating whether Seth and SamLevinson, agents to Giants leftfielder Melky Cabrera, arranged a relationshipbetween former client Paul Lo Duca and steroid distributor Kirk Radomski, BobNightengale of USATODAY reported.Nightengale, citing three people with knowledge of MLBsinvestigation, reported that Lo Duca alledged that the Levinsons introduced himto Radomski and set up a checking account for Lo Duca to pay Radomski forperformance-enhancing drugs.The investigation was sparked by Cabreras positive test fortestosterone two weeks ago for which he was suspended 50 games. In an attemptto beat the charges, Cabrera and his associate Juan Nunez created a falsewebsite to try to create the defense that Cabreras positive test was theresult of a tainted product purchased over the Internet. The Levinsons told theNew York Daily News that Nunez was a paid consultant of their firm, ACES Inc.but not an employee.There is absolutely no truth to the allegation that eitherof us had any involvement in procuring performance-enhancing drugs for MelkyCabrera or any other baseball players, the Levinsons said in a statementissued last week by a criminal defense lawyer. Nor did we have knowledge thatanyone else was doing so.MLB is also looking into Cabreras Miami-based trainer, Cesar Paublini, USA TODAY reported, but Paublinisaid he hadnt been contacted by MLB. He also said he had never met theLevinsons but that Cabrera had once introduced him to Nunez.The Mitchell Report first revealed Lo Ducas relationshipwith Radomski and uncovered three checks from Lo Duca to Radomski for 3,200each. Radomski said in the Mitchell Report that the checks were payments forhuman growth hormone.USATODAY obtained a copy of one of the checks, which revealed that Lo Duca andSamuel W. LevinsonCO ACES Inc. were listed as joint account holders. Theaddress listed on the check matched the address of the Levinsons Brooklyn office.Seth Levinson told USA TODAY he had no relationshipwith Radomski and declined to comment on ACES Inc.s name appearing on thecheck sent to Radomski.Radomski pled guilt to money laundering and distribution ofsteroids on April 27, 2007. According to Nightengales sources, Lo Duca said henever met Radomski in person but talked to him on the phone to get advice onusing the performance-enhancing drugs responsibly.MLB wants to question Radomski on his relationshipwith the Levinsons and whether he was a paid consultant of their firm.