“…Many methods have been studied trying to find the fastest, most accurate and most economical means to detect AQMs: X-ray imaging (Schatzki et al, 1983(Schatzki et al, , 1984Schatzki and Young, 1988), NMR (Rollwitz and Lewis, 1983), odor detection (Pennella, 1996), quadrupole resonance analysis (Rayner et al, 1996), and thermal neutron analysis (Brown and Gozani, 1996;Miller et al, 1996). Of these methods, sniffing dogs and X-ray imaging are currently in use.…”