Grayson is an idiot. While you absolutely would not want to risk going into a previously contaminated area, the lethality of chemical agents like Sarin actually dissipates fairly quickly, in about 30 minutes.
That doesn’t mean that you couldn’t suffer significant nerve damage from being exposed after the majority of the agent dissipates, but it’s not like many people depict - that is, if you just touch something slightly contaminated you will most certainly DIE.
I agree Grayson is an idiot- but does anyone else but me think those photos of the dead ‘gassed’ in Syria look staged?
I saw the photos of those gassed by Hussein in Iraq, and they were hideously contorted in pain and discolored.(Saddam, not Barak)
These looked like they could wake up and walk away