From FOX News:
Human rights activists are turning their attention to the drone program in part because they say there's no warning to innocent civilians who are in a targeted area.
Human rights activists at odds with President Obama over his recent national security decisions are indicating that they might legally challenge the U.S. military's use of Predator drones, a weapon that intelligence officials say is their single most effective tool in combating Al Qaeda in Afghanistan and Pakistan.
Predator spy planes are unmanned aerial vehicles that are virtually invisible when flying overhead. The Air Force uses them frequently in Afghanistan and Pakistan, where they are able to track and hit targets from the air when mountainous terrain makes it notoriously hard to send troops.
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My Comment: This legal attempt will go nowhere with the exception of creating publicity .... which is probably the main reason for doing this.