The heads of the Bali suicide bombers were all found lying on the floors of the bombing sites to be quickly and easily identified.

I noticed that the hotel bombings in Jordan that happened some time after that did not leave any bombers' heads lying around.
By contrast, DNA samples were taken of the bloody pulp left over after the bombers blew themselves up in the three Jordanian hotels.

Gruesome, yes.
Suspicious?
You decide.