Telepathy

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Telepathy is a promicin-induced ability that allows its user to read the conscious thoughts of others. To untrained users, this ability causes its user to suffer severe headaches and rage outbursts as the sheer mass of individuals stray or directed thoughts can potentially overwhelm the user, but they can take holiparodol, an anti-psychotic medication, to quieten the "noise" and calm them down, though losing it risks a relapse. With time, the ability can be refined to selectively screen out a specific persons thoughts, while blocking out others, and the thoughts are hears clearly and resounding in the user's own mind. This ability is highly useful, as it can e.g. allow a spy glean information from others without detection, an assassin to track down specific targets without asking a question etc.

4400 Gary Navarro has this ability.