I don't think we should be talking bad of the PI working this case. There is nothing to be gained from it, and there is nothing out there that shows he is a bad person. Several members here are attesting what a good worker he is. Just because someone is working with BJD does not automatically make them bad. Carrie Mcgonigle worked early in the case with BJD and no one was talking bad about her! We should be happy that ANYONE is willing to take on Hailey's case, and even to do it pro bono!
I am interested in how closely the PI is investigating SA or other family members like CD, PT, NS.... I hope his focus is on everyone and not just on an outsider or stranger abduction. While possible, I think Hailey's disappearance falls closer to home.
As for the letter....I question its veracity. It is common for criminals to make up stories and "snitch" on people to try and get their sentences lowered. Also, there is nothing in the letter to indicate Hailey was sold to cover a drug debt. If the letter is legit, there are other reasons why she could have ended up there. Maybe she was kidnapped off the street, maybe she was sold, but either way the letter is not specific enough for us to know for sure.