User blog comment:Zilla4444/Update for Executioneer's Calling and Avarice Blade/@comment-4834593-20120610045720

"The passive damage also can delay or break stealth. For example, Teemo Teemo's Camouflage Camouflage will not activate while the passive is in effect."

I haven't finished reading, but I think he should be able to go to stealth, because, if I am not VERY mistaken (I would've noticed), he can go stealth while his poison is still working.