For detecting booby-traps in buildings and tunnels, it seems the IDF has multiple approaches. At times the most efficient approach are the trained canines with an astute sense of smell for explosive and obstacles. Then the trained IDF demolition soldiers seem next in line, but not having enough of either of these on the ground, they have been recruiting Gazans, who often have little to no training, to enter first into the building or tunnelling, while they are wearing video cams so the more technical soldiers can observe the riskiness.