Like most humans, goingdown, empaths can be recognized by what you receive from them. That old "know them by the fruit they bear" statement someone once made.
Like everything it's walking the walk, not talking about it, that's the proof. And like Leia said probably pretty much everyone has the seed. Not everyone will or can grow it and not every tree grows straight and strong.
Jenn was also very much right when she said that like any skill empathy has to be trained to use well, otherwise it's likely to harm both empath and those they wish to assist.
Follow Leia's link and find other info from that. I think that will getcha started on a reasonably sure footing.
Nikki