on the blindingly obvious

Yesterday in Con Law:

Prof. B: So let's say Capital Metro has a policy of not hiring people who are shorter than 5'7" because according to a study they've commissioned, people 5'7" and over are safer drivers. Your client is 5'6" and wants to challenge the policy. What would you do?

Classmate: Well, first, I'd commission more studies--

Prof. B: Well, ok...I mean, you can commission as many studies as you want, but that doesn't mean they're necessary. I read about this study once where the researchers discovered that male monkeys feel pain when their testicles are crushed. It's kind of like, "Duh! I could've told you that!"