Garland had I believe one weapon charge (possession of prohibited weapon) dismissed, and 'prohibited weapon' could mean many things (other than firearm), (see link below). And if a charge is 'dismissed' can we just assume he was guilty anyway and that it should have a bearing in this case? That, I believe was a charge from 1988 when he was 28? And then an assault charge in 1989 which was 'stayed', and never brought forward after that, so no convictions or presumed guilt in those regards.
One could presume that he just kept on doing bad, illegal things after spending a few months in jail in his younger years, even into middle age, without any evidence or even hearsay of that, and assume instead that he was just 'better at not getting caught'.
Or one could presume that after spending a few months in jail, he cleaned up his act and didn't get into any more trouble, grew up, got properly medicated if needed perhaps, got counselling perhaps, became involved in his own business venture, took over management of the acreage, whatever. If there was anything derogatory to dig up on DG during the years after he plead guilty to the meth lab charges, I'm certain, imho, that MSM would have dug it up to let the public know, as they have with every other derogatory thing they could find on him, including 'hearsay' about being expelled from university and the reason being cheating, even though that has not been backed up with fact as far as I have seen, but I haven't seen anything to suggest that he continued a life of petty crime, has anyone else?
It is correct that if he didn't have a green truck similar to the one seen on video, LE might still be looking along other avenues, or at different potential suspects. I'm not sure if that is a good thing or a bad thing that they aren't looking, and seemed to drop other potential avenues and POIs (as LE had previously stated they were looking into) as soon as they found that DG owned a green truck. It will be sad if when the preliminary trial takes place, if it is determined there isn't enough evidence to prove guilt, or if when the trial eventually takes place, it is determined DG is not guilty.
http://en.wikibooks.org/wiki/Canadian_Criminal_Law/Weapons#Prohibited_Weapon (BBM)