It should be possible, but might take a lot of effort. Smell-detecting dogs are trained from birth to 18 months and it takes another 6 months to specialize them

It should be possible, but might take a lot of effort. Smell-detecting dogs are trained from birth to 18 months and it takes another 6 months to specialize them on specific scent like diabetes. Small rodents could be trained too. In Harry Potter, Ron carried one in his breast pocket.