Prosecutors have launched a bid to bring new charges against a man acquitted of murdering a teenage student in the 1990s.
The Crown Office is using double jeopardy legislation in an attempt to retry Francis Auld over the death of Amanda Duffy.
Her body was found on waste ground in Hamilton, Lanarkshire, in May 1992.
Prosecutors want judges to set aside Auld's acquittal from his original high court trial and try him again for the murder.
The Double Jeopardy (Scotland) Act 2011 sets out conditions where an accused can be retried for a crime in which they were previously acquitted.
Any retrial requires high court judges to give prosecutors permission to proceed against the accused.
A two-day hearing began in private on Tuesday heard by Lord Carloway, Scotland's most senior judge, Lord Bracadale and Lady Dorrian.