Page 141
The exception is more likely to be relevant to a diplomatic spouse who works.
46
Proof of diplomatic immunity
Whatever the basis for immunity under the Convention, it is for the person claiming it to establish
that he is entitled to it. Immunity can never be presumed. In an attempt to smooth their passage
through foreign customs and immigration, some states issue diplomatic passports to government
ministers, members of the legislature and sometimes even persons with no public office. But the
possession of a diplomatic passport or diplomatic visa is, in itself, never proof of immunity. To
prove it requires evidence that (1) the person holds a position in a diplomatic mission which confers
immunity and (2) that the immunity covers him in the particular circumstances of the case.
47
How
these matters are established depends on the law and practice of each state. Obviously, the foreign
ministry of the receiving state can help, but it has to be careful not to pre-empt the local courts. Even
the apparently simple act by the foreign ministry of confirming that Mr Smith has been notified as a
diplomatic agent serving in the Embassy of Ruritania does not prove that the person claiming
immunity is Mr Smith – that also has to be proved. And, even if he is, as we have already seen – and
will see again when we discuss other members of a diplomatic mission – whether his immunity
applies in the particular circumstances of the case is a question of law. Some states (e.g. the United
States) will sometimes certify to their courts points of fact and law; other states (e.g. the United
Kingdom) will certify only matters of fact.
48
A foreign ministry may nevertheless indicate, albeit
informally, whether it considers a person a member of a diplomatic mission. In doing so, it is
important for the ministry to be even-handed. In responding to any factual enquiries about
diplomatic status, the ministry must always remember that a successful claim of immunity could
severely affect the rights of others. It must therefore not only consider the matter with great
46. See p. 147 below.
47. This equally applies to persons claiming immunity as a member of a special mission (p. 155 below), a
consular officer (p. 158 below), a head or former head of state (p. 176 below) or a person connected with
an international organisation (p. 200 below).
48. Section 4 of the Diplomatic Privileges Act 1964 provides that a certificate by or on behalf of the
Foreign and Commonwealth Secretary is conclusive evidence as to the facts in it. The question of
immunity is for the court alone.