Re:nuclear resonance is MRI without the "imaging" (Score 1)

not all n14 is equal. NQR frequencies and pulse patterns are specific the the quadrupolar crystaline structure that the nitrogen is bound in. Thus ALL n14 containing substances discovered so far that exibite NQR signals have distinct "fingerprints'. N14 in shoe leather is a non-issue. That said, NQR does have many limitations that make it best for a complimentary technology and not a magic bullet.