(Or, unless they can vegetables or other edibles and want to avoid botulism. People don't need to can, when they can buy canned food!)
And if a pressure cooker can be a bomb, why not a paint can, or a five gallon bucket?
A friend told me that he saw lots of IED’s hidden when the terrorist scum used expanding foam to make curbs in the street with the bomb hidden beneath the curb,
Ban insulating foam NOW!