Los Angeles District Attorney's Office spokeswoman Sandi Gibbons told ABC News that this is not the first time Polanski has been in this situation, but he typically hears about a possible arrest ahead of time.
"He hears that he might be arrested if he goes to another country, so he doesn't go," she said, using England as an example.
If and when Polanski is extradited, she said, he will appear in a Los Angeles court. Gibbons said Switzerland is just one of several countries U.S. authorities have worked with to take Polanski into custody.
"We have made requests through diplomatic channels where we've received info that he will be traveling to other countries that have a treaty with the U.S.," she said, calling Polanski a "fugitive." "There has been several times where we have prepared necessary documents with the countries that have treaties with the U.S."
After a period of relative quiet in the 1980s and '90s, Polanski burst back on the scene with 2002's "The Pianist," the tale of a Polish Jew trying to survive in the Warsaw ghetto during World War II.
The film earned three Oscars, including for best actor and best director, though Polanski, due to the warrant for his arrest if he returned to the United States, did not attend the ceremony. He did, however, receive a standing ovation from many audience members when his name was announced.
He was also the subject of a 2008 documentary "Roman Polanski: Wanted and Desired" that explored the frenetic judicial process after he was arrested and the media circus that enveloped the case.
Polanski became involved with the 13-year-old girl after her mother approved a private photo shoot in hopes of furthering the teen's acting career.
She said he supplied her with champagne and Quaaludes and assaulted her at Jack Nicholson's home. Nicholson's then-girlfriend, Academy Award-winning actress Anjelica Huston, was at the house at the time.
In 2003, Geimar spoke to ABC News and said she wished Polanski would return to the U.S. to end the ordeal for both of them.
"I would love to see him resolve it," Geimer said at the time. "And I think we've always had the position of, you know, the sooner the better."
Geimer said that after Polanski's arrest, she and her mother were blamed for the incident.
"You know after the publicity came out and stuff, I knew it was just as bad for him as it was for me," Geimer told ABC News. "I'm sure if he could I'm sure he'd go back and wouldn't do it again."
Though for years, Polanski maintained that the encounter was completely consensual, he seemed to change his attitude in a 1994 interview with ABC News' Diane Sawyer.
"I know now it was, it was not the right thing to do," he said at the time. "But I was, there was no premeditation, you know, it was something that just happened."
ABC News' Christel Kucharz, Christophe Schpoliansky and DeeAhna Hernandez, Carolyn Durand and Pierre Thomas contributed to this story.