Ed's Manifesto - "One of the knives used by the London terrorist attackers last week. Note the selection of a non metallic blade to circumvent metal detectors, the dedication to grip and
knifes/weapons that can not be detected by metal detectors | Squat the Planet
Exploring Non-Metallic Knives: From Ceramic to Plastic | Backdoor Survival
Ceramic knives on sale at Aldi cannot be detected by security scanners | Gold Coast Bulletin