It has sent off samples for virus tests, which have so far been negative.

BBC: Lambs

Other samples would be shipped for off-site analysis under strict protocols to protect the samples and ensure an unbroken chain of custody.

BBC: How to investigate chemical weapons allegations

There is no guarantee against unscrupulous inspectors clandestinely collecting samples and conducting off-site analysis to glean information on the chemical content of American products and the processes involved in making them.

CENTERFORSECURITYPOLICY: Chemical Weapons: Say No to This Troubled Treaty