User blog comment:EmpyreanSmoke/Supernatural Q&A/@comment-27006668-20151025184716

1. Why can't angels posses people without their permission?

2. Are they physically able to do it but its forbidden to them?

3. Can God change this?

4. Can archangels be expelled once in a vessel? Because Lucifer took the gag off Sam and wasn't worried Sam would expel him.

5. What's the difference between normal blades, and archangel blades?