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WASHINGTON – The Obama administration’s public case for attacking Syria is riddled with inconsistencies and hinges mainly on circumstantial evidence, undermining U.S. efforts this week to build support at home and abroad for a punitive strike against Bashar Assad’s regime.

The case that Secretary of State John F. Kerry laid out last Friday contained claims that were disputed by the United Nations, inconsistent in some details with British and French intelligence reports or lacking sufficient transparency for international chemical weapons experts to accept at face value.

After the false weapons claims preceding the U.S.-led invasion of Iraq in 2003, the threshold for evidence to support intervention is exceedingly high. And while there’s little dispute that a chemical agent was used in an Aug. 21 attack outside of Damascus – and probably on a smaller scale before that – there are calls from many quarters for independent, scientific evidence to support the U.S. narrative that the Assad regime used sarin gas in an operation that killed 1,429 people, including more than 400 children.

Some of the U.S. points in question:

• The Obama administration dismissed the value of a U.N. inspection team’s work by saying that the investigators arrived too late for the findings to be credible and wouldn’t provide any information the United State didn’t already have.

U.N. spokesman Farhan Haq countered that it was “rare” for such an investigation to begin within such a short time and said that “the passage of such few days does not affect the opportunities to collect valuable samples,” according to the United Nations website. For example, Haq added, sarin can be detected in biomedical samples for months after its use.

The United States claims that sarin was used in the Aug. 21 attack, citing a positive test on first responders’ hair and blood – samples “that were provided to the United States,” Kerry said on television Sunday without elaboration on the collection methods.

Experts say the evidence deteriorates over time, but that it’s simply untrue that there wouldn’t be any value in an investigation five days after an alleged attack. As a New York Times report noted, two human rights groups dispatched a forensics team to northern Iraq in 1992 and found trace evidence of sarin as well as mustard gas – four years after a chemical attack.

• Another point of dispute is the death toll from the alleged attack Aug. 21. Neither Kerry’s remarks nor the unclassified version of the U.S. intelligence he referenced explained how the United States reached a tally of 1,429, including 426 children. The only attribution was “a preliminary government assessment.”

Anthony H. Cordesman, a former senior defense official who’s now with the Washington-based Center for Strategic and International Studies, took aim at the death toll discrepancies in an essay published Sunday.

He criticized Kerry as being “sandbagged into using an absurdly overprecise number” of 1,429, and noted that the number didn’t agree with either the British assessment of “at least 350 fatalities” or other Syrian opposition sources, namely the Syrian Observatory for Human Rights, which has confirmed at least 502.

An unclassified version of a French intelligence report on Syria that was released Monday hardly cleared things up; France confirmed only 281 fatalities, though it more broadly agreed with the United States that the regime had used chemical weapons in the Aug. 21 attack.

• Another eyebrow-raising administration claim was that U.S. intelligence had “collected streams of human, signals and geospatial intelligence” that showed the regime preparing for an attack three days before the event. The U.S. assessment says regime personnel were in an area known to be used to “mix chemical weapons, including sarin,” and that regime forces prepared for the Aug. 21 attack by putting on gas masks.

That claim raises two questions: Why didn’t the United States warn rebels about the impending attack and save hundreds of lives? And why did the administration keep mum about the suspicious activity when on at least one previous occasion U.S. officials have raised an international fuss when they observed similar actions?

On Dec. 3, 2012, after U.S. officials said they detected Syria mixing ingredients for chemical weapons, President Obama repeated his warning to Assad that the use of such arms would be unacceptable. Then-Secretary of State Hillary Rodham Clinton chimed in, and the United Nations withdrew nonessential staff from Syria.

Last month’s suspicious activity, however, wasn’t raised publicly until after the deadly attack. And Syrian opposition figures say the rebels weren’t warned in advance in order to protect civilians in the area.

Among chemical weapons experts and other analysts who have closely studied the Syrian battlefield, the main reservation about the U.S. claims is that there’s no understanding of the methodology behind the intelligence-gathering.

They say that the evidence points to the use of some type of chemical agent but that there are still questions as to how it was collected, the integrity of the chain of custody of such samples, and which laboratories were involved.