for more, we're joined by brian castner, amnesty internanation's senior crisis advisor on arms and militaryrations. welcome to democracy now! if you could lay out for us the global usese of tear gas and thn we w will talk about t the unitd states. >> sure. i i think we he seseen with h te protests around the world, esespecially we sougught in e beginning -- the end of last year, there were protests all over the world, erect, hongng kokong, latin america, andnd for many of those cases, tear used by police. what w we saw is thibrbroad tre, not just being used, but i it is being misused, anand how quicy it i is being ed. unfofortunately, many y of t tys of incidents, some of the worst misuse we have seen overseas, we are now seeing in the united states as well. one is using tear gas in confined spaces, where people are trapped, where they can't get away from the tear gas. we saw this in hong kong but we've also seen it in seattle, philadelphia, a terrible incicident where people were trapped against a highway embankment and could not get over a fence. we have also seen where tear gas grenades