That's not what this means. One can ask whether the belief is reasonable, that is justifiable by a reasoning process. The argument for applying the GFE in this

That's not what this means. One can ask whether the belief is reasonable, that is justifiable by a reasoning process. The argument for applying the GFE in this case is that the probability of false positives from a perceptual hash match is low enough that it's OK to assume it's legit and open the image to verify that it was indeed child porn. They then used that finding to get warrants to search the guy's gmail account and later his home.