CNN CNN Newsroom September 7, 2013 21:04:00
Seen but what can be heard. it's important to note the videos do not prove who conducted these weapon attacks. those assertions by the u.s. government come from other information and analysis. there are various ways they can test these victims for traces of sarin gas. experts have been telling us that the videos and the reaction are very consistent with a sarin gas attack. >> we do this for a living but i have to admit this is disturbing to watch seeing people writhing in pain on the floor and many of them dead. >> reporter: absolutely. >> what's the value of seeing these videos? people are ha...