Is Jay-Z right about police encounters in his song 99 Problems?

We all know the song. 99 Problems by Jay-Z. In verse two, the rapper offers up a story of a policeman stopping him for "going 55 in a 54." Jay offers his thoughts on what the policeman can and cannot do under the law. But is Jay-Z right? Read this legal analysis by law professor Caleb Mason: 

www.slu.edu/Documents/law/Law%20Journal/Archives/LJ56-2_Mason_Article.pdf

I turns out Jay-Z knows more than the average Joe, but be careful, he's far from an expert in criminal procedure; and if you follow his advice too closely, you might end up in a pickle.