"If they go into the scales in favour of the prosecution, they must go in very much as a matter of light weight, and solely to inform you that this is someone that does have the potential to be aggressive and violent towards somebody else. But, you could only use it in that way if you were sure that in fact he does have that past conduct against him, and you might, therefore, think out of absolute fairness, that it is best to disregard these matters. I cannot tell you as a matter of law you must disregard them, but you certainly must take care not to allow this information to decide the case and to sway it against him."