You forget when Herc went and grabbed the portable mic from the spy store and stuck it in a tennis ball.  Or when they stuck the video camera in the park and got it stolen.<p>It&#x27;s pretty much the same thing that happened here.  They knew the discussions were happening, they knew where the discussions were happening, and since it was in a public space they didn&#x27;t need a warrant.  It&#x27;s not like they are running around town putting microphones in all the bus stops hoping to catch anybody saying something.  They were looking for a specific type of criminal activity and they placed the mics accordingly.