moving from non comm property state to a comm property state

so how can they ask for the non borrowing spouse's debt when it states that property acquired by either spouse in a non community property state is not converted into community property by the mere act of taking it into a community property state and establishing a domicile there? Also states; in washington, personal property acquired by either husband or wife in a foreign jurisdiction, which is by law of the place where acquired the separate property of one or the other of the spouses, continues to be the separate property of that spouse when brought within washington state. please explain this to me because i just don't understand....thank you