The person sheds skin rafts and chemicals that are carried away from them on the wind as scent.

A dog’s nose has 50 times more receptors for scent than a human and 40 times the brain capacity for interpreting what it smells. Additionally - 4 legs, all terrain and keen to work.

Training a dog to seek out human scent in unexpected places with a handler who can interpret the dog’s behaviour, means that large, difficult areas can be searched efficiently in all conditions, day and night.