can be anything from losing a job, which is common among employment shooters, relationship breaking up, something happening at school. but something happens so that people around them notice there is a marked change in their behavior. they re acting different. that s important. from my perspective. if we can help people identify those crisis points and intervene that could be helpful. bill: illegal gun, handgun made at home in santa clarita. what did you find about illegal guns in america? we tried to code exactly how people got their guns. it was difficult. we had a lot of missing data. 9% were using illegal firearms. for school shooters actually those under 18, 80% of them used guns that they take from their family members. bill: wow. how do you best think we can learn from what you have done on your research? how do you think as a country