A couple that appeared on the hit Bravo show Below Deck is accused of using the identities of cast members from the show in a scheme to obtain prescription drugs. Dr. Francis Martinis, 55, a Long Island urologist, and his wife, Jessica, are preparing for a court war after the alleged plot unraveled earlier this year, RadarOnline.com has learned. Red flags were raised when Jessica was suspected of attempting to fill a fraudulent oxycodone prescription at a New York pharmacy this January, leading a pharmacist to call authorities. An investigation soon revealed that Martinis had sent dozens of pr…