A computer expert has claimed it was highly unlikely that extremist Islamic propaganda was planted on a terror suspect's laptop.
The laptop was left switched on for 71 minutes by special branch
Mohammed Atif Siddique from Alva, Clackmannanshire, has denied five charges at the High Court in Glasgow.
The 21-year-old's trial has heard that footage and clips of Osama Bin Laden urging young Muslims to become suicide bombers were found on the computer.
The laptop was taken from the student at Glasgow Airport in April last year.
It was turned on by a special branch police officer, and left on for 71 minutes before it was examined by IT experts.
Forensic analyst Michael Dickson told the court that the footage could have been put on the laptop during that time.
He said: "It would be possible to transfer the material, however, it would take effort to make it look like it had come across at different times."
However, he added that special software would be needed together with computer expertise.
Earlier, Mr Dickson told the court that someone using the account of M. Atif Siddique viewed a fundamentalist Islam website featuring Abu Hamza and other Islamic websites.
He said it had happened at Ibrox public library on four dates in February and March last year.
Mr Siddique was arrested in Alva in April last year
Mr Siddique was arrested at his family home in Alva in a police operation on 13 April 2006, eight days after the computer was seized.
He has been accused of possessing suspicious terrorism-related items including CDs and videos of weapons use, guerrilla tactics and bomb-making.
He has also been accused of collecting terrorist-related information, setting up websites showing how to make and use weapons and explosives, and circulating inflammatory terrorist publications.
A further charge of breach of the peace relates to claims that he showed students at Glasgow Metropolitan College images of suicide bombers and terrorist beheadings.
This charge also includes the allegation that he threatened to become a suicide bomber, and claimed to be a member of al-Qaeda.
The trial, before Lord Carloway, continues.