[deport]

Here's the basis for the Courts ruling.

Basically they are taking the line that reads:
"Photo ID issued by the federal or any state government"
and saying that the Memphis Library system comes under the state government body section.

From the following:

CLICK

snip
“Showing a photo ID is not a significant intrusion or burden,” read the appeals court ruling written by Judge Andy D. Bennett, who decided the case along with Judges Richard H. Dinkins and D. Michael Swiney. Bennett cited photo ID requirements to board a plane, enter federal buildings and cash a check in upholding the state law.

“Photographic identification is probably the best way of making sure a voter is the person he or she claims to be,” Bennett added citing past U.S. Supreme Court rulings that the burden in terms of cost for such identification is not substantial.

State case law, he added, “supports finding that the city is a branch, department, agency or entity of this state” under past Tennessee Supreme Court rulings on that specific issue.
end snip

[TennesseeGirl]

By the judge’s determination that a city within Tennessee is a branch of the State government, and therefore can issue valid i.d.s, I take that to mean we no longer have to have driver’s licenses issued by the State. Shoot, each city or county can issue their own. Why not? If the city/county is a branch of the State by his Honor’s reasoning, hey, screw the State issued gun permits. Each city/county has now been given the authorization to issue their own. The judge, by extension, says they have the authority, right? (rhetorical) Gosh. No more state issued real estate licenses, contractor’s licenses, healthcare licenses. Yoohoo! (sarcasm, but not directed at you)