Dust.
Not just the street term for any telepathy-based drug, the original Dust substance (concocted by the Psi Corps as a field experiment) is still the most powerful of its kind. When inhaled, injected, imbibed or smoked, Dust reacts instantly with the user's nervous system and actavates the portions of the user's brain andd DNA responsible for telepathy. Users gain 2D3-1 in P-Raiting, access to the Surface Scan and Deep Scan Telepathic abilitys for 2D6 hours and an efective Telepathy score equil to 1D6 plus thier Wisdom Modifier. They will have no control over thier abilitys, however, and will need to make Concentration skill checks DC 15 not to try and scan everyone they come into contact with - which can cause a great deal of Power boosting rolls for the low-powered Dust user.