>Immunity does not mean that foreign agents can suddenly operate with impunity inside the US. Interpol is just a big club of nations who want to co-operate policing efforts on crimes that span borders. Participants appoint their own Interpol representatives and set laws to govern them. Apart from this, Interpol has no legal jurisdiction in any country. In the US the representative is a branch of the US Dept of Justice whose powers can be set and revoked locally as required.
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>Immunity has a number of effects, not least that the US representative now can participate in sensitive activities/information that (for example) other nations might be reluctant to share if the information might be subject to seizure and/or exposure in a US Court. But US Interpol people still have to obey the law of the land as they do in every other participating country.

And they can do pretty much anything, now that they're exempt from search, seizure or any serious investigation. Quis custodiet ipsos custodes? Well, it's just been declared there'll be nobody overseeing them for real. They may have to report to some upper body, but... they can say whatever they want, their "archives are inviolate". If this once becomes the Praetorian guard, well, I spoke.