Diplomatic Immunity

Diplomats representing their countries (e.g. ambassadors) in host countries enjoy diplomatic immunity, which protects them from having to face charges in court for any alleged wrongdoing they might have committed.
Other than the example below that caused a big storm that threatened bilateral ties btw US and India last year, you may also want to think of the Romanian diplomat (Inoescu? go google!) in Singapore who was involved in a drink driving incident which killed one (or two?) lives and then fled back to Romania under diplomatic immunity.

Sample Qn:
To what extent is it possible to make the punishment fit the crime? (Cam. 2013)