The question of whether diplomats should be fully immune from criminal prosecution, no matter what the alleged crime, is one that is neither new nor free from dispute. As a matter of international law and United States domestic law, the source of the immunity and the extent to which it extends is quite clear.
Zaid, Mark S.
"Diplomatic Immunity: To Have Or Not To Have, That Is The Question,"
ILSA Journal of International & Comparative Law: Vol. 4
, Article 29.
Available at: http://nsuworks.nova.edu/ilsajournal/vol4/iss2/29