Indy in State of Indiana v Richardson while not part of the conclusion (I believe the conclusion is what sets case law) it states.
http://www.in.gov/judiciary/opinions/pdf/06031001fsj.pdf pg 6-7
And the conclusion states that for the reasons above. The quote above is one of the reasons for it. But I'm not sure that it constitutes binding case law.
OK, I knew there was a reason I thought that valid! Thanks for adding that!