The message
from "JennyC" contains these words:

A friend asked, half jokingly, "how can I get my hubby to chew 8 of
them.......?"

I suspect that slight possibility has far more to do with companies
withdrawing ricinus seeds (some seed companies have done it too), than
fear of terrorists using the garden centre to stock up. It's not unknown
for the kind of publicity that we've just seen, to result in copycat
attempts by disturbed people, or daft kids.

Janet.