anti-espionage law

A fishy guy who introduced himself as a prospective student (around 23 years old) came over to my department from Michigan this morning. I am extremely wary. I suspected him as a spy from rival school. He met our faculty menbers to spy on their research interests. Besides that, believe me or not, he was bold enough to attend class to scout it. But his luck ran out when he took a seat next to me in the class. I scared him a lot. He seemed to realize that I was aware of his real identity. He beat a hasty retreat halfway through the class. I won. Absolutely I won.