History
Diplomatic Immunity and Its Legal Boundaries
Quick fact
Diplomats have full criminal immunity and broad civil immunity in the host country, making them effectively above the law there, but this protection is not personal privilege—it belongs to the sending state, which can waive it at any time.
Why this is interesting
What would happen if you couldn't be arrested for breaking the law? For foreign diplomats in the US, that can be true—but only under very specific circumstances.