An Old Bailey jury trying a Muslim convert for terrorism offences has been warned to guard against prejudice and fear.
Michael Mansfield QC told jurors: "Unless you are alert, there is a chance that subconsciously it will affect your judgment in the case."
He said the prosecution had not proved Andrew Rowe (34) was doing anything illegal when he was arrested at the Channel Tunnel in October 2003.
Rowe, of Maida Vale, north-west London, denies three charges of possessing articles for terrorism under Section 57 of the Terrorism Act.
The prosecution allege he had a pair of socks with explosive traces on them which could have come from a mortar.
A notebook containing details on how to use a mortar and a code referring to weapons and targets were found at his addresses in Birmingham and London.
Rowe told the court he had been to Bosnia and had recently been approached in Germany to act as a courier to provide aid and arms to Muslims in Chechnya.
The trial continues.