I fully agree with Michealr too.

I hope that someone might just follow my link up from 04 May 10 - 05:23 PM on the evidence given to the Hearing looking at the use of drones

One of the witnesses was Mary Ellen O'Connell from Notre Dame Law School

She has written -

"The CIA's intention in using drones is to target and kill individual leaders of al-Qaeda or Taliban militant groups.

Drones have rarely, if ever, killed just the intended target.

By October 2009, the ratio has been about 20 leaders killed for 750-1000 unintended victims. Drones are having a counter-productive impact in Pakistan's attempt to repress militancy and violence."

Unlawful Killing with Combat Drones: A Case Study of Pakistan, 2004-2009

"The use of the drone is, therefore, violating the war-fighting principles of distinction, necessity, proportionality and humanity."