For Mark Medina, Stephen Paul Gale was the one who got away.As chief criminal investigator for the Nevada Secretary of State, Medina chased suspects accused of defrauding people out of more money — but even after his retirement, Gale’s case sticks out. “I remember having a strong sense when I was looking for him, ‘Boy, this guy’s really got a core group of people that are just covering for him,'” Medina said in an interview.Now, Gale is in custody in Los Angeles after a wild police chase through that city in August, tracked down after being indicted this past April on charges he raped two young women working in a Framingham clothing store in 1989.While he was in Las Vegas, Gale was operating under the alias Paul Costa and, according to the affidavit Medina wrote, running an investment scheme where he claimed returns of up to 20% to investors looking …