Detection of explosives dogs v/s sensors

The paper present some characteristics of a dog's sensing power towards explosives and a challenging threat on dog squad by the introduction of machine based sensors. It includes the working of a potential squad and its drawbacks in certain fields. In this technological era scientists are busy with technology and machines for all purposes including explosive detecting machines. Some recent studies shows sensors are mimics of nose of a dog with improvements and are capable of detecting explosives very effectively but are they quite alike dog's olfaction without drawback is the common question arising.