Under Arizona law, in an uncontested marital environment, for Social
Security reporting purposes, any child born in wedock is the legal
offspring of the spousal father, regardless of biological paternity.

True or false.

I bet that it is true, because the law has most probably not caught up
with the possibilities of genetic testing  - or even blood type
testing -  and it will probably still assume in an uncontested
situation that the child is the husband's.
Why should it assume anything else?

If your question is not just hypothetical, you should get an Arizona
legal opinion, since even the most well-researched answer  - whichever
way it goes -  can only result in your having to get a local opinion.

Hi pelkeyrobyn!

The Arizona Supreme Court has created the free booklet, "Things You
Should Know About Establishing Paternity for Your Child in Arizona?

Quoted from page 6:
?Under Arizona law, if the mother was married any time in the
ten-month period before the baby is born or when the baby is born, the
husband is presumed to be the child?s legal father. In this situation,
the voluntary process to establish paternity for the biological father
can only be used if the husband gives written consent to another man
being declared as the father. If the husband will not consent, court
action may be necessary to establish paternity. If the husband cannot
be located after reasonable effort, paternity may be established
without his consent.?

You can download this booklet in PDF format here:
http://www.supreme.state.az.us/dr/pdf/paternity.pdf

I think this is the answer you are looking for. Hope it helps!