Improvised Explosive Devices are as devious as the minds of the persons who create them. Over the years, like with conventional weaponry, this method of warfare has also evolved to achieve greater assured destruction. The Liberation Tigers of Tamil Eelam of Sri Lanka, before it was decimated with frontal military assaults had earned for itself considerable notoriety in the use of IEDs and belt bomb triggering tactics used by suicide bombers were said to be its creation. India has learned two lessons: 1) The dog is the best detector of explosives and 2) Counter-insurgency is a manpower intensive warfare.
Source: The IED Menace