For a polity of its size, Isermno is remarkably safe. Experts credit the duchy's efficient justice system. Persons convicted of serious felonies are flown five miles out to sea and placed in a maximum-security facility Isermno calls "the Atlantic Ocean." Incidentally, this is also what the rest of the world calls Isermno's prison system. Only one prisoner is known to have escaped prison and returned to the duchy. When he was discovered just off Isermno's shore, he had lost a lot of blood. Thankfully, much of that blood was found in the surrounding waters by a helpful group of sharks. His remains were then delivered to his next of kin in a plastic thermos.
The lack of publicly available data on armed protests evidences the rock-solid stability stemming from the duchy's effective community policing. In the highly unlikely event that civil unrest were to occur, the duchy has enacted a progressive amnesty program. Upon permanently and publicly renouncing their subversive intents, any Isermnoan subject may return to the duchy, no matter where in the world he may be located. Once these wayward subjects arrive on Isermno's shores, specially trained counselors guide them along the process of reintegration into their native soil, having first issued them each a shovel. Those who complete the program never commit crimes, and indeed, are never seen or heard from again. Therefore, one can only assume the program is 100% effective. In what must be a completely coincidental data point, the island's farmers attribute year to year bumper crops to the perennially fertilized soil.