Smock is part of Campus Ministry U.S.A., based in Columbia, Mo. The organization's goal, according to Smock, is to spread the gospel of Jesus Christ across U.S. college and university campuses.

Private donations fund his full-time preaching, through which he said he has traveled to college campuses in every state and abroad for 33 years.

He said he chooses to preach at universities because there is such a diverse spectrum of the world's population. Students are the next generation of politicians, scientists, entrepreneurs and journalists, Smock said.

Smock uses a style of preaching he calls confrontational evangelism to try to convince college students there is a better way to live their lives.

Ryan Callahan Mike Leisner, foreground, takes a break Friday after preaching to a crowd gathered in front of Northrop Auditorium. Leisner and George Edward Smock preach in a style that some evangelical groups say is too aggressive.The police left, but would soon return.

A few dozen people had gathered around Smock, and when police showed up the second time, officers approached him. After speaking to him, the officers brought him to the rear of the squad car and searched him against the trunk.

Heidi Kitrosser, a University law professor who specializes in constitutional and free speech law, said there is a category of speech called "fighting words": speech so inflammatory it encourages others to fight.

The Supreme Court of the United States has been sensitive to not restricting offensive speech, or allowing a "heckler's veto." It is not generally an acceptable reason to restrict speech, she said.

"If he's saying, 'I hate these groups, or I think these groups shouldn't be allowed to live,' as offensive as it is, that's generally allowed," she said.

The Court's most definitive ruling regarding incitement to violence is Brandenburg v. Ohio, which makes illegal intentional speech likely to cause imminent and unlawful action, Kitrosser said.

Speech often can be regulated based on where the speech is taking place, such as if crowds build up in certain areas, or there may be rules about speakers touching spectators.

Naomi Scheman, a philosophy and gender, women's and sexuality studies professor, on Monday saw Smock saying the Bible is a good book and the Quran is an evil book.

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