That was clever of them. It still doesn’t cast suspicion on all pressure cookers, and for the purposes of the test, since we can’t see inside the pressure cooker, it’s just a pressure cooker, not a bomb.
The test should have included a U-Haul truck, a la McVeigh et al. It *can* contain a bomb, but is not a bomb.
What about cans of soup on a kitchen table arranged a certain way? In Kingman, Arizona.