Metsuke
In Shogun 2 the metsuke are your daimyo's secret policemen, recruited through the market building chain. Metsuke ensure loyalty and obedience from friendly generals and keep your settlements and armies safe from enemy subterfuge when positioned inside them. Metsuke can also bribe enemy garrisons, generals and armies, and detect and apprehend enemy agents. They are especially vulnerable to removal from the game through conversion by enemy monks or missionaries.