Chemical weapons in Syria? What Obama's high bar for proof could mean.

“Even if CW [chemical weapons] were used, [the response] will depend a bit on how much and what we’re talking about,” says Mr. White, the former State Department official.

If chemical weapons use is proven “there will have to be some response from the administration,” he adds, “but unless it’s indiscriminate use, I don’t see us doing something like a no-fly zone that could really make a difference.”

Given Obama’s pattern to this point of gradually ramping up humanitarian aid and non-lethal material assistance to the rebels, the administration might bow to French and British pressure to approve providing the rebels with arms, White says. “But something like that, that might have made a difference 18 months ago, won’t be a game-changer now.”

That’s because the rebels are now so divided, and because the groups the US would be willing to arm are not the ones – specifically the more extremist Islamist factions – achieving advances against Assad on the battlefield.

White, who is now an adjunct scholar at the Middle East Institute in Washington, says the administration may be “playing for time,” with its talk of deliberate evaluation of evidence, as it tries to overcome its deep divisions over how the US should approach the complex and ever-deepening Syria crisis.

But it also may be that the “evidence” its allies have provided the US – supposedly photos of victims with tell-tale signs of chemical-weapons contact from the Israelis, soil samples in the case of the French and British – isn’t very convincing.

Secretary of State John Kerry said in Brussels Tuesday that Israeli Prime Minister Benjamin Netanyahu told him in a telephone conversation that he was unable to confirm assertions from Israeli Brig. Gen. Itai Brun, head of research and analysis for Israeli military intelligence, that Syria has used chemical weapons several times since the first of the year.

British military intelligence officials originally reported in late March their finding that Assad’s forces had actually used an intense military-grade tear gas in a reported attack March 19 on the city of Halab. Reports claimed that 30 people died in the attack, but the tear gas is not a chemical weapon and it was not clear what caused the deaths.

White says Iraq’s Saddam Hussein – who used chemical weapons to kills thousands of Kurds in 1988 – also used a military grade tear gas known as CS on Iranian troops who were advancing on the southern Iraqi city of Basra in 1982. The gas repelled the Iranian forces but did not kill them by the thousands as a nerve gas would have, White says.

The United Nations has formed an investigative group to go into Syria and determine what chemical weapons if any were used, but so far Assad is not letting the team in. And without such a team on the ground, it may remain impossible to deliver the kind of “conclusive evidence” the Obama administration says it has yet to see.

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