A Demoniac or Just a Troubled Young Man?

A Young man stopped for a Bible while Tony ministered on the corner of Harrison and Locust, in Davenport, Iowa.

At different times during the conversation, the young man would start to laugh. It was difficult to discern if the young man was simply troubled, nervous, or if there was something more nefarious going on.

Was he simply a troubled young man affected by the use of psychotropic medication or could he have been influenced or possessed by a demon?