Deaing A News Today

Future attacks. joining me now is david katz, a former deaing a, a firearms and u.s. homeland security expert. what do we know about the possible chemicals in the hands of terrorists? i dont want to necessarily say chemical weapons. i want to say weaponized chemicals, what do we know? >> this is nothing new for them. they tried this in the past. not too many years ago the subway attacks were made by sarin, low concentration, poorly disseminated, potentially catastrophic. we know from everything ...