LIBS is laser based. Laser creates green light 532 nanometers. Laser is directed onto carpet. Electrons of atom nucleus are "excited", when the laser is turned off, electrons go back to ground state and emit energy they had produced during excitation. The energy is released as a photon of light. Picked up by fiber optics and can be measured by spec. Therefore LIBS can be used to ID elements in a sample.
I personally think JB is objecting to get this into the record for appeal. He has to object for procedure. jmo