Thank you all for your input and information!
I said nothing about financial aid or cheating the system and I did not mean to imply anything like that! Perhaps I asked my question the wrong way - perhaps emancipation and out-of-state tuition don't go hand in hand, maybe emancipation only goes hand in hand with federal aid - I don't know - that's why I'm here asking for info. Forgive my ignorance. My son mentioned emancipation since he wants to go out of state (his grades are average so not much hope for scholarships -at least big ones). I apologize if I offended anyone.
IMO, no one reading what you wrote could reasonably have decided you were interested in fraud.
Without bringing financial aid into the conversation, you could probably find out what would be needed to establish residency, perhaps even from the school.
I googled for CA requirements, and the requirements are clear:
http://www.reg.uci.edu/registrar/residence/
Here is some CO info:
http://sfs.colostate.edu/I27000.cfm
WA:
http://futurestudents.wsu.edu/admission/residency-ind-parents.aspx
The point is, it's not a state secret as to how each state determines residency.
Now, about the state vs private thing...you might be surprised by the schools he might get into. I was a B student with only Drama going for me, and I got into a pretty good, small, private university.
And because it was smaller, the financial aid people could really get to know you, and could take the time to look at your paperwork beyond what the system told them. During the year or so before I went to college, my mom's marriage fell apart. When he left, he took 2/3 of our income with him. But by tax return, we had ALL that money. The system kicked me out, saying that there was no need for aid. Once she wrote a letter explaining (this was her second marriage, NOT my dad, by the way), they were able to do it manually, and I got a hefty aid package. Then she got remarried to her childhood sweetheart, and he made quite a bit of money. Again, their tax returns showed no financial need. But she wrote again...since he only became my stepdad by the time I was 18, there was no need for him to contribute, and the aid office was able to only use my mom's income to determine my need.
A huge university might not be able to do that.
Just something to think about!