I have some theories about Justin's birth mother, Amber. Two, really. One is that Seth actually killed her which is why she couldn't be found. And another being that she took Justin's advice and left Seth. She saw how the Jensens, Clay especially, took care of Justin and decided that he deserved better then her, and realized that before she could see him, so she's probably in rehab trying to get clean. But, these are just my theories. What do you guys think?