For the curious of mind, environmental chemicals introduced into air circulation systems and closed rooms…
NEEDS CONSTANT RE-APPLICATION OF DELIVERY TECHNIQUES TO MAINTAIN IT’S EFFECTIVE IMPACT. OTHERWISE CHEMICALS FADE WITH TIME. I SUSPECT ONE REASON IS THE DELIBERATE ATTEMPT TO AVOID DETECTION WITHOUT A PERMANENT MARKER LEFT BEHIND SO AS TO NOT INCRIMINATE. NOTHING IS AVAILABLE AS DIRECT EVIDENCE.
Which makes those affected readily DIS-CREDITABLE ! Take your pick of fav group.
BTW – Chemicals are changed so as NOT TO WISE UP TO TODAY’S MENU !
Live~NRGY 
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