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Of the eastern goouta district where the attack took place lasted it. they are there and they want to go and theyre not being allowed to collect samples from the area. and exactly why is in dispute. they say theyre not being allowed by russia and syria. russia and syria have given different accounts as to high they cant leave. first it was security reasons saying the situation on the ground wasnt safe enough, orthr times it was a bureaucratic excuse saying they didnt have the right parm. with ti...

Getting any blood on him, without being discovered. >> so what did happen to debbie hawk? the defense floated this theory. debbie worked in pharmaceutical sales. perhaps a drug addict had gone after the samples she kept in the van. all of the pharmaceuticals in her van were missing. somebody took them. >> that was a ludicrous idea, countered the prosecution. debbie carried very few samples. anyway, if drug theft was behind it why didnt the thief take any jewelry or electronics. no. it seemed to ...

And weve seen people honking their horns and suggesting maybe a element of victory here. this is the lesser option and raises the question they believe sarin and chlorine was used but that doesnt appear to be from existing testing of samples. and there must have been

Its liquid. it starts to turn into a gas. its colorless and odorless and you dont know when kruf been exposed until you feel it happening. you you do test it, have you to find samples and sometimes, it will breakdown and there is a lot of testing. >> chlorine can cause symptoms for a different reason. it can turn into hrdrocoloric

By the chlorine would be difficult to a certain but even the engine has been used and that sort of remains in the blood of the infected and they would be able to collect samples but again they can auckland pin the blame on anybody they can really find out if they are. and how to actually respond in beirut thank you. to brazil now where thousands have turned days in rio de janeiro demanding answers in the slaying of city councilwoman mariella franco she was shot and a month ago after an event on ...

The gas. weve heard samples tested suggest maybe a mixture of chlorine and sarin. it was sarin used to spot the bombings back in april last year. the 59 tomahawk missiles and barack obamas red line was crossed by its use in 2013. so are we talking about a new moment here in which the chlorine possibly sparks international response? well, the u.s. itself has canceled 50 separate instances of the syrian regime using this since the war began. are we in a moment where every time a strange gas is sme...

May be sarin use and now were hearing from the senior official saying a combination of chlorine and sarin. why is that significant? >> well, its a couple of things. significant because what they do is they mix it. its mostly chlorine which is kind of weaponize and they mix in sarin to make it more deadly. thats a nerve agent banned by the treaty on chemical weapons. >> chlorine is not? >> chlorine is not, however, the weaponization of chlorine is banned under this convention. the u.s. is being v...

>> were not sure who has the samples and whether the so-called chain of custody would give the u.s. high confidence. what officials said to me yesterday was, well, we have the sympt symptomology. it looks like a chemical weapon. it walks like a chemical weapon. we have proof enough. but, i mean, in terms of this attack now the international community, you know, is right to -- and the russians and syrians are going to ask for more evidence. but he also talked about, you know, the price to pay and...

Symptoms. and because it starts to vaporize quickly, it can be hard the to test. when you do test it, you have to find those samples qukly and sometimes, it will break down and you have to find the by-products quickly. its just a lot of testing and you u dont have time for that. youre in a dangerous situation and you cant get the samples. >> how do the effects of chlorine differ? >> what it does is when it hits water or in some of the areas of your body that have more water rich, it will essenti...

Chlorine. is that the new tipping point? secretary mattis didnt necessarily say last night. we reported earlier this week that the u.s. has samples that prove that the attack a last weekend in douma included weaponized chlorine and there was the presence of another nerve agent. when asked about that, secretary mattis didnt give a lot of specificity. he wouldnt rule out that it might have been s he erin. or another nerve agent. they are still looking into that. it is not really clear. would anoth...