The key witness going to bat for Alex Rodriguez in his shocking suit against Major League Baseball is an ex-con who did hard time for weapons and drug possession.
Robert Miller, who told The Post he’s been working at “odd jobs’’ in Florida since his career as a pot dealer came to a screeching halt, admitted that between 1992 and 2010 his address was either a state prison or a federal prison.
The 41-year-old Coral Gables man has been arrested twice by the feds and multiple times by authorities in Florida.
— In March 2001, he was sentenced to three years in federal prison for conspiracy to possess and distribute marijuana.
— In November 1995, he was sentenced to just under 20 years in prison after he was convicted in federal court of possession of a firearm. The stiff sentence was due to the fact that he already was a convicted felon.
— His dozens of state convictions included raps for grand theft and burglary.
— He admits to using pot, coke and LSD since he was 9, according to court papers.
Miller’s role in A-Rod’s legal action will be to back up the fading superstar’s claim that MLB made a devil’s pact with Anthony Bosch, the owner of the Florida anti-aging clinic Biogenesis who is accused of peddling performance-enhancing drugs.
MLB agreed to pay Bosch $5 million to help railroad the Yankee slugger, A-Rod claims in the Manhattan Supreme Court lawsuit filed Friday.
Miller, who describes himself as a former “confidant’’ of Bosch, insisted he hasn’t gotten a penny.
He told The Post in a phone interview that he had a “falling out’’ with Bosch six weeks ago over a $5,000 debt.
Miller, 41, said he warned Bosch that he would go public with his story if he didn’t get the money.
The ex-con insisted he was “a best friend to Bosch when he had no friends.’’
While they were pals, Miller said, Bosch “was drugged up every day” and was very verbal about his relationship with Major League Baseball.
Miller claimed Bosch received a check once a month from MLB but said he did not know the amount. However, he insisted that Bosch told him the total payout was to be $5 million.
Meanwhile, as his camp was trotting out ex-con Miller, A-Rod lawyer Joseph Tacopina was slamming MLB Commissioner Bud Selig for relying on his own sleazy witness, Bosch.
“Commissioner Selig’s and MLB’s inexplicable personal animus toward Alex Rodriguez has brought them down to the level of protecting and relying primarily on a witness [Bosch] under federal investigation for dealing performance-enhancing drugs to minors.’’
Tacopina called on players and fans to force Selig to justify the “witch hunt.’’
Additional reporting by Dan Martin and Liz Pressman