I appreciate the info you have shared; it's always helpful to have an inside perspective. You seem like a kind hearted person wanting to believe the best of your friend. I am afraid you're in for a big disappointment, though. It's extremely unlikely that all of these things she is claiming to be untrue are actually untrue.
If, as someone else mentioned, BC's phone was found in her home, a fingerprint test would have been done and if her prints were not on it, why would she have been accused of "receiving" it?
If the lease is in her name and not AL's, she could have had him removed from the residence by contacting police.
Just because she was in class doesn't mean she didn't have anything to do with the murder. I don't think there's any chance that an arrest warrant for capital murder would have been issued without solid evidence. LE doesn't want to risk a lawsuit for false arrest, especially on such a serious crime in a high profile case.
One of my favorite quotes comes from Maya Angelou: "When someone shows you who they really are, believe them."
I looked up false positives for pcp. Almost all the medications that can cause a false positive are medications that are highly abused. No way to know for sure with that one, I guess. I know I never had to take a drug test for nursing school, and it's also not standard practice for drug testing to be required in custody cases either.
This sounds like a mean, mean post and I'm sorry for that. I work with substance abusers and can see holes in stories that a less cynical and jaded person wouldn't recognize.