There's a provocative piece in the current issue of the AUVSI's offical magazine, Umanned Systems. It asks how likely it it is that terrorists will use UAVs, which is as you might imagine is a question that comes up quite often for those of us in the open source UAV world, where we don't restrict who uses our technology.
The article notes that UAVs are not the best choice for terrorists delivering explosives, given their complexity and relatively low carrying capacity, but does raise the issue of UAV-distributed chemical and biological weapons. It quotes Vann Van Diepen, then the Department of Defense's acting deputy secretary for nonproliferation, warning in 2002 that UAVs "are a potential delivery system for weapons of mass destruction and indeed and ideally suited for the delivery of chemical and biological weapons, given UAV's ability to disseminate aerosols in the right place at the right altitudes."
But others quoted in the article are less concerned. Wayne Morse, president of American Dynamic Flight Systems, a UAV maker, said it's unlikely that terrorists would choose UAVs. "It doesn't make sense. UAVs are very complex and terrorists want to terrorise. How can you best do that that? If you have people willing to kill themselves, that's what terrorizes. So why aim UAVS at the Super Bowl when you can have somebody walk up and self-detonate before they go through stadium security and cause mass panic?"
Renting a Cessna would allow a terrorist to carry a much larger load, much more simply, Morse said.
The article is available as a pdf
to AUVSI members. BTW, joining AUVSI costs just $50 a year for individuals, and comes with a free Unmanned Systems subscription. Highly recommended!