diplomatic immunity

from The American Heritage® Dictionary of the English Language, 5th Edition.

• noun The exemption enjoyed by diplomatic agents, their families, and members of their mission staffs from many ordinary criminal and civil laws of their host country, as determined under terms established by treaty and international law.

from Wiktionary, Creative Commons Attribution/Share-Alike License.

• noun A diplomat's immunity to prosecution and/or litigation under local law.

from WordNet 3.0 Copyright 2006 by Princeton University. All rights reserved.

• noun exemption from taxation or normal processes of law that is offered to diplomatic personnel in a foreign country