But I fail to see why due process wasn't followed... Judge should have sanctioned raid in that case anyway, right (or how does it work)? And there's always some

But I fail to see why due process wasn't followed... Judge should have sanctioned raid in that case anyway, right (or how does it work)? And there's always some arbitrary line where someone decides 'that's enough for a raid', we just have to hope that whoever it is, he/she has a good common sense. In your example, if that person wasn't working in agriculture (and still suddenly bought large amounts of fertilizer etc.) And was seen with radicals/known offenders. And was known to distribute radical literature. In that case do you think raid was justified? Because that's really the way to stop terrorist acts, all that things they do for security at airports are useless, you can't do anything if there's determined crazy person with bomb on the streets, it's too late. That FBI's machine learning algorithm is just have to be good, to be used. FBI should be force by fear of bad media in case of wrong outcome to tune it for no false positives.