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flickr user Ted Eytan / http://j.mp/1SPGCl0

Deciding who should be allowed to use what bathroom has consumed a lot of attention across the country, and certainly here in Michigan.

With all the controversy about public restrooms and transgender people using the ones that match their gender identity, let's roll back the years to figure out just how sex-segregated bathrooms came to be in the first place.

Terry Kogan is a professor at the University of Utah's College of Law. He has spent the past decade considering the rights of transgender people, and the public restroom question in particular.