Many police K-9 units are equipped with a canine that is able to perform scent detection or suspect apprehension.
Here are the reasons to employ a specialized police patrol K-9. They provide multiple solutions: scent detection, explosives or firearms and ammunition, or drug detection, as well as suspect apprehension, when tracking, plus handler protection. Of course, there is one more reason, they are cost-effective for small police agencies, which might have a restricted budget and can’t afford multiple dogs.
No one K-9 should be trained in both explosives AND narcotics due to safety issues. A drug detection K-9 may improperly alert on explosives and this could potentially lead to fatal consequences.