Are SAS walking shoes rated "non-slip?"  I need to document this to
wear them to work.

It might be useful to know contect here.  I did some preliminary
work under the assumption that you needed something defined for
the US, and thus probably the Occupational Safety and Health
Administration.

If this is the case, then the answer is maybe.  :)

"Non-slip" or "slip resistant" doesn't appear to be rigidly defined.
The OHSA has a definitation from their <em>nonmandatory</em> table that
says slip resistant is defined as as having a Coefficient of Friction 
(static I presume) of greater than 0.5

http://www.osha.gov/pls/oshaweb/owadisp.show_document?p_table=INTERPRETATIONS&p_id=24511

This appears to be for surfaces or for shoes.

Other than that I can find no further reference.

No, as for SAS shoes, they appear to be a small operation located
in San Antonio, TX with no on-line presence.  I would suspect
calling them for information might be your best bet.

://www.google.com/local?q=sas+shoes&hl=en&lr=&sa=G&near=San+Antonio,+TX&radius=0&latlng=29423889,-98493331,29837998,-97988632

All of this depends on what your work requires, i.e. how do they make
their list?

For other researchers:

Google: osha non-slip shoes
OSHA: Search of just regulations for slip-resistant and shoes

Google: SAS shoes ...Then to local for the factory store

If you are looking for Slip resistant shoes for restaurant work, you
can find a very good brand here:
www.shoesforcrews.com
I've worked in food service for 20 years and swear by these!

Info on the company can be found here http://www.historyofshoes.biz/sas_shoes.htm

the  site http://www.historyofshoes.biz/sas_shoes.htm is not correct
for the company you are referring. SAS Shoemakers is based in San
Antonio, TX.