Registration, Plates, and Licenses
Diplomats are not required to have a state-issued driver’s license, vehicle registration, or license plates. Instead, the State Department issues these items and designates the particular level of diplomatic use of vehicles with license plate prefixes or suffixes (“D” for diplomats, “C” for consuls, “S” for administrative staff, and “A” for international organizations such as high-level United Nations officials). But the license plate should not be relied upon as proof of the status of the driver or passengers in lieu of their official identification cards.
Exceptions
Nothing in the Vienna Convention prevents police officers from taking necessary measures to protect public safety. Although it would be rare for an immune official to create an incident that might get him or her expelled or prosecuted, officers should remember that diplomatic immunity is not a barrier to protection of public safety. In exigent circumstances, take all reasonable and necessary steps to secure your safety and the safety of others, and consider issues of immunity only after the situation is under control. An impaired driver, for example, need not be permitted to drive away from a stop, but should be driven by unimpaired staff or sent home by taxi.
Also, since sovereign immunity belongs to the nation, rather than the individual diplomat, it can be waived by the sending nation, thereby making the individual subject to prosecution. Therefore, in any case where a person subject to diplomatic immunity is suspected of a serious or violent crime, appropriate reports should be made and available evidence preserved. It is the stated policy of the State Department to request a waiver of immunity in every case where the prosecutor advises that charges would be pursued except for diplomatic immunity.