PinkMan,
I'm no expert here but I remember asking the same thing. I was told, anectdotally, that the 787 was supposed to be having a "web" of electric magic filaments embedded in the layers which apparently will highlight any subcutaneous fractures or potential damage to an onboard system - most likely not accessible to the crew - hardly good for crew morale!
These would be in addition to any conductive elements re: lightning strike.