Bullshit. A pressure cooker is probably one of the most common kitchen accessories ever. Anyone who planned to use one for malicious intent would just deny that they have one.
cops also ask you if you have drugs in your car.
I'm sorry I can't tell if your response is written in a joking manner or if you are serious but while reading it I got this funny visual of a cop responding to a routine noise disturbance by asking the offending homeowner "any pressure cookers in the house?"
i am not joking
So are a bunch of other materials used in household bomb-making. Doesn't preclude the cops from asking about them, especially if you got flagged as a potential bomb-maker because you posted about explosives on Facebook or something.