WASHINGTON (CNN) -- The judge in the criminal trial of Lewis "Scooter" Libby might get a sense Monday morning of where the jury is at in its deliberations as he holds a hearing on questions the panel sent out Friday.

Libby's trial took 14 days of testimony, and eight days of deliberations so far. The five-count indictment alleges perjury, obstruction of justice, and false statements.

The jury's latest message may show a struggle to understand the term "reasonable doubt." Friday's question suggests some members of the jury are looking for a complete absence of doubt, while others understand that the standard of proof expected from prosecutors falls short of that.

Former federal prosecutor Alex Rene told CNN, "It could show jurors are trying to convince others you don't need this level of evidence to find reasonable doubt."

Libby's defense is based on defective memory. His lawyers tried to show their client had an overwhelming workload at the White House, including urgent national security matters that could have caused discrepancies in what he told investigators.

Libby was both chief of staff and national security adviser to Vice President Dick Cheney.