Example: any drug can have some side effects with some probability. So basically an unknown set of people will have the side effect. But there is no way for m

Example: any drug can have some side effects with some probability. So basically an unknown set of people will have the side effect. But there is no way for me to objectively test whether I will have the side effect. The description of some drugs even contain: we have no idea how this works, it just does (for some people, also with unknown “parameters”).