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Border advocates. here to defend his study is john lot of the crime prevention research center along with immigration attorney allen oh rmpleght. professor lot, let's start with you. because you have been doing a lot of research over the years about different topic, guns and violent crime and now you focused on arizona. and you heard mary ann member dose is a who will always be a grieving mother who is turning her sadness into righteous anger and her results. her study looked at 33 years of statistics. tell me about your methodology? because it's coming under assault. >> right. well, there hav...

Border advocates. here to defend his study is john lot of the crime prevention research center along with immigration attorney allen oh rmpleght. professor lot, let's start with you. because you have been doing a lot of research over the years about different topic, guns and violent crime and now you focused on arizona. and you heard mary ann member dose is a who will always be a grieving mother who is turning her sadness into righteous anger and her results. her study looked at 33 years of statistics. tell me about your methodology? because it's coming under assault. >> right. well, there hav...