School Zone? Really?

I'm driving home from work, minding my own business, when I see police lights behind me. Sound familiar? I still think it's the pink LSU emblem on the back of my Jeep. The officer walks up to my car, asks for my license, and says, "Do you know you're speeding?" I was driving 32 mph in a 35 mph zone. I was not speeding. The officer proceeded to tell me that I was in a school zone and the speed limit was 20 mph. Excuse me! I was traveling on Interstate 35 when I exited onto Corporate. I was on the off ramp, which is a loop around that circles and then goes up a bridge and over the interstate. My first question was, "Where is the school?" Suspended in air? Seriously. I'm on the exit ramp from the interstate! I doubt that anyone built a school here. The officer's response to my questioning was, "What can I say? I'm just one of those cops that writes tickets." I'm furious. I circled back around to see of there was a school zone sign, or even a school. There was, but not where anyone coming off the interstate could see. The sign was on Corporate, on the other side of the bridge. I drove past the officer and saw him giving another person a ticket. Unbelievable!