Deputy U.S. Marshal James Barry responded to cross-examination about e-mails he uncovered that were sent from Riley to Gonzalez. In the e-mails, Riley informs Gonzalez about his negotiations with a Newport dealer to by .50-caliber rifles. Gonzalez did not reply to any of those messages, Barry said when asked.

Riley's attorney played a long surveillance video shot by marshals from the foot of the Browns' driveway June 7. During that day, Riley was arrested by a team of hidden marshals, after he stumbled upon them while walking the Browns' dog. The video was grainy and difficult to make out but appeared to show Riley strolling down the driveway with a cup of coffee and the agitated dog. A man in camouflage pops into the frame, and then Riley is seen running back up the driveway, out of the frame. Choppy footage of camouflaged men milling about the area continued for about 15 minutes.

Barry said he was not there when the video was shot and couldn't answer many questions about it. He did say that Riley was shocked with a Taser that day but that no deadly force was used by marshals.

Prosecutors also introduced a nearly 90-minute edited audio recording of a radio broadcast July 29. Riley called the show to report that he had heard shots fired on the Brown property. According to Riley's account, he and another Brown supporter, who has not been charged, heard between 30 and 40 shots behind the house. They also heard leaves rustling and twigs cracking nearby. Riley asked listeners to come help at the property and said the house was "surrounded."

"This is a life-or-death situation. This is the real deal," Riley says in the recording. "We're at our battle stations. We're ready to lay our lives down for you."

Local and federal authorities later said they were not operating near the Browns' home that night.

The trial is expected to take three weeks. Robert Wolffe, a fourth supporter who was charged with similar crimes, pleaded guilty and is on the government's witness list. The Browns, who are in prison for their tax crimes, have not been charged in connection with the standoff.

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