>> school safety is a complex issue with no simple, single solution. but i believe trained, qualified armed security is one key component among many that could provide the first line of difference as well as the last line of defense. >> reporter: the debate over semi out automatic weapons has raged since friday sandy hook, and used rounds of ammo to murder 20 children and six women. and increasing police presence at schools would be effective and a third said somewhat effective and 12% said not effective. 42% said banning the sale of assault and semi automatic weapons is a good idea. two out of ten said somewhat and more than a third said this would not be effective. and maryland congressman steny hoyer says the n.r.a.