Anything with "bad" energy is a spiritual teacher.

I can discern spirits. Sometimes just from looking into their eyes. Now maybe that is because I am a empath or its because I have been exposed to so much evil in my life. Probably both.

With the whole meth and number 4, I think there may be even more. Someone doing drugs in the past isn't enough for me to get a negative vibe from them! Perhaps it's more her doing meth made her steal and other stuff to feed her addiction, rather than her doing the drug itself.

Actually, I agree with you. No one's energy is 100% pleasant and pure all the time. And it would be a judgmental world if we just went by energy all the time! But, at the same time I'm not going to live with a sociopath roommate just to torture myself either! I lived with narcissists for 25 years, and that's enough for me. 

Opalina, both!

Could be. I really don't know. I just know that something was telling me that something was off about her.