A three-judge panel is deciding whether to overturn Casey Anthony's four convictions for lying to law enforcement.
Lisabeth Fryer, the attorney representing Anthony, argued during Tuesday's appeal that Anthony was in police custody while she was being questioned about her missing daughter and should have been read her Miranda rights.
Assistant attorney general Wesley Heidt represented the prosecution and argued that Anthony was not in police custody during the interrogation and could have left whenever she wanted.
If the judges find that Anthony was in police custody when she lied to investigators because she was never read her Miranda rights, the statements should have been inadmissible in court and there would be no basis for the convictions.
Watch the video to see In Session correspondent Jean Casarez explain the details of the police interrogation.
A jury acquitted Anthony of all the charges related to her child's death, but convicted her on four counts of lying to police. She was sentenced to four years. But, with credit for the time she served before and during her trial, she was released from jail on July 17, 2011.
Anthony is also facing a defamation lawsuit brought by Zenaida Gonzalez. Gonzalez alleges that Anthony defamed her and damaged her reputation when she claimed that a nanny named Zenaida Fernandez-Gonzalez had taken her daughter Caylee. Anthony's criminal attorneys acknowledged at her murder trial that no such nanny ever existed.
Gonzalez's defamation suit is on hold until Anthony's appeal is ruled upon. The court does not have a timetable to issue its ruling, but court officials said it could come as soon as 30 days.