Here's the article.
It should be noted that this technology hasn't been developed yet, but it's something the good folks in the military-industrial complex are working on.
One of my favorite quotes from the article.
"What we have here are the beginnings of something designed to enable robots to hunt down humans like a pack of dogs. Once the software is perfected we can reasonably anticipate that they will become autonomous and become armed."
Via my IT man Gary P., Via New Scientist