What I don't like about this is that they were allowed to turn the devices on again that were illegally placed in the first place. They should have had to turn them off forever because they were illegally placed. I would compare this to collecting evidence without a warrant, getting the warrant and then using that evidence. (which as far as I know is grounds to have the evidence thrown out)
They could be throwing out all previously collected data and now just using new data collected after the warrant was obtained. As far as I know, the FBI takes pretty seriously collecting evidence outside the scope of warrants.
