How do you find out someone's past?

There are many ways. You could start by looking up there name from where they use to live and call those that match and see if they know, call there family members or old friends that may know, you could do a search online, search classmates to see if they are a member, hire a private detective if your desperate and have money, there is always a way to get to at least a family member or friend that could point you in the right direction. Good Luck,