This happens in Canada, too. There was a thread on a popular storm chasing forum in 2007 in which a chaser driving from Florida to Canada was stopped by the Canadian border patrol and had his car randomly searched. The post is also here on the chaser's personal blog: http://sky-chaser.com/america.htm#WINDSOR . They grabbed his laptop that he was using for GPS mapping, brought it inside, then came back out and told him he was being detained in order to investigate the photos he had on his drive. Apparently they were concerned that some of his Asian nudie pics were of underage models. He was then arrested until some specialist could come in and interview him and review the photos to determine if they were underage. After waiting several hours in a cell, the investigator showed up, asked him a few questions, then released him. "You are good to go. We have insufficient evidence and cannot find anything related to the charges suspected, we are sorry for the inconvenience and I hope this does not prevent you from visiting Canada in the future."