Strategy Page speculates that Zarqawi could have been tracked by what Iraqis (and probably lots of others) think of as magic:
For the last ten years, development of "smart dust" has moved right along. "Smart Dust" is basically very miniaturized electronic devices. This is similar to stuff like RFID, smart cards, EZ Pass and those rice grain size tracking devices you can have injected into your pets. But Smart Dust takes this all to a new level by being small enough to be disguised as dirt, the kind you can pick up in your shoes or clothing.
Nanotechnology can be used for good or evil. I’m glad Zarqawi didn’t have access to it. Future criminals (the elite ones) probably will. Within 20 years. You heard it here first.
Ooh! Magic dust that follows people around and sometimes kills them. That’s neat. Move along now. Nothing to see here people.