Several years ago (and I’m sorry that I cannot cite references for this) a relative of the Brazilian ambassador (son or nephew; I can’t recall) was discovered bringing illegal narcotic substances into the USA, and selling them.
I don’t know just how the CIA found out about this, because diplomatic pouches and luggage are, of course, exempt from US Customs searches, but evidence of the kid’s activities were in fact discovered, and the proof was formally presented to the ambassador, with a demand that the jerk be expelled. He was.
Naturally, nothing happened to him at all, either here, or in his own country, and he probably went to another Brazilian embassy in another nation, to do exactly the same things, with impunity (as well as immunity).
One time, I was visiting friends in DC, several years ago, and I went to a kind of “Bar & Grill,” located near Georgetown University, for some sandwiches and a Virgin Mary.
While there, one of the patrons became very unruly and began to smash glasses and dinnerware all over the place, while screaming obscenities at one of his dinner companions. Naturally, when the DC Police arrived on the scene, they attempted to arrest him on a variety of charges.
But before they could place handcuffs on him, he pulled out an official ID card, proving to the cops that he was attached to a foreign embassy, and that he had diplomatic immunity. The police then politely requested that he leave, and he did (probably to go to another drinking establishment).
I won’t mention the name of the foreign embassy to which he was connected, because, as I was told by my friends, the next day the ambassador of that embassy made a personal visit to the establishment, and wrote out a bank draft payable to owner of the restaurant, which more than covered all of the damages.
That was a nice gesture on the part of that ambassador, because it is my understanding that diplomatic immunity also prevents embassy personnel from being defendants in lawsuits, among other “perks.”