Haunt
Haunt: very possibly the first designer drug to have its entire production line confiscated by the NSA and its manufacture given a Top Secret: Code Word (APPLESEED GIRAFFE). The people making it also found themselves suddenly, and reasonably profitably, working for the Alphabet Soup, too. All very deniable, all very fast – and all very effective, too.
Makes sense, though: Haunt is a kind of mildly alarming drug. People who take it find themselves feeling intangible and absolutely pain-free: they can still see and hear things, and move about (like they had an astral body: the actual body doesn’t move), but cannot touch anything or be touched. This intangibility extends to being able to walk through walls, seemingly fly or pass through the ground, look inside complicated machinery; when the drug wears off, the user snaps back into his body, seemingly none the worse for wear. The experience is invariably highly pleasant, thus why it was used a designer drug.
Why is it classified? Because Haunt actually is a drug that allows users to astral travel to a nearby parallel universe. From what researchers can gather, said universe has a timeline almost identical to ours, although it’s starting to diverge from all the reports of ghosts showing up, looking around, and giggling. Same countries and cultures, different Presidents and celebrities, that sort of thing. The alternate’s version of the Alphabet Soup made a deal with our version: get Haunt use under control, and we can use some of their conference rooms for really secure meetings and whatnot. For that matter: most of the alternate governments can find a use for somebody who can walk through walls and not care about local politics. The only trick is finding some way to pay the ‘ghosts’…