from Schneier on Security by schneier
Terrorists attacking our food supply is a nightmare scenario that has been given new life during the recent swine flu outbreak. Although it seems easy to do, understanding why it hasn't happened is important. G.R. Dalziel, at the Nanyang Technological University in Singapore, has written a report chronicling every confirmed case of malicious food contamination in the world since 1950: 365 cases in all, plus 126 additional unconfirmed cases. What he found demonstrates the reality of terrorist food attacks.
It turns out 72% of the food poisonings occurred at the end of the food supply chain -- at home -- typically by a friend, relative, neighbour, or co-worker trying to kill or injure a specific person.