If the mind is unable to differentiate between things that really happened and things that have been visualized, I would think that it doesn't do much in the way of discernment. Don't the critical factors come into play when we use our conscious mind (mine sure seems critical...)?
However, I don't think I'd PhotoRead a bunch of stuff that is either too negative or to which I heavily object. If/when it bubbles up to the conscious, then it has to be dealt with.
