As a whole, Humanity doesn’t have many Psionic individuals. It took contact with alien races with demonstrable Psionic abilities to move Psionics from the realm of fantasy. Now that humans know that Psionic abilities are possible, the major powers are hungry to exploit them. Some use financial incentives to recruit any talents they find. Others use less generous means to coerce cooperation. Regardless of how they go about recruiting people, the major stumbling block is in finding potential recruits. If there’s a technological means of detecting Psis, none of the powers have (or are admitting to having) figured it out yet. This means that discovering a new Psi requires a “sniffer”, another Psi who is sensitive to Psionic talent. Quite often, these sniffers are contracted Psionic aliens.