Power of Attorney is ONLY GOOD AS LONG AS THE PERSON WHOM YOU HAVE POWER OVER IS LIVING.
This gives a person the power over your business in the case you are not able to handle matters. Such as if you were physically ill, mentally ill, or in prison. Once you are dead there is no Power of Attorney over you.
No, it is not because Scott is still considered the rightful owner of Laci's part of the property.
If you go back and read my postings at #245-#379, I do believe you will see that he has the right through the Power of Attorney to have the Peterson's sell the Community Property, but none of Laci's Personal Property. (Which I believe her ring is considered Personal Property since it was a gift to her by Scott) Half of the proceeds from the sale of Community Property would then go into the estate of Laci Peterson, which Scott cannot benefit from IF HE IS CONVICTED OF KILLING HER.