A second defence argument was that two new witnesses say they saw armed police at the scene when George was arrested, contrary to official reports about the circumstances of his arrest – the Metropolitan Police maintain there were no armed officers present during the arrest of George. There was scientific evidence alleged to link Barry George to the murder in the form of a single microscopic particle of what was said to have been gunshot residue, together with evidence as to the character of a fibre found on his clothing. It was argued by the defence that the presence of armed officers and their involvement in his arrest might have been responsible for the gunshot residue.