The following article was published in the New York Post, January 7, 2017:
FEAR in your FOOD: It’s alarmingly easy for terrorists to contaminate our food supply, by Hank Parker
http://nypost.com/2017/01/07/its-alarmingly-easy-for-terrorists-to-contaminate-our-food-supply/
Back in 1984, in a rural town near Portland, Ore., a woman lurked by a salad bar at a restaurant with a plastic bag in her hands. After checking that no-one was looking, she opened the bag and emptied a brownish liquid over the food.