Admittedly not particularly user-driven

Notwithstanding that it enables an arguably anti user-centric modality, the British governments 2004 policy of authorizing torture provided that they

“neither procured the torture nor connived at it.”

would appear to be a perfect application of federated identity, i.e. you want the info, but don't want to concern yourself with the messy details of how it is obtained?

I see the need for a 'Torture Context' syntax. This would give to RPs the extra information they need to assess the assurance level of the confessions - everybody knows water-boarding is far more trustworthy than sleep exhaustion for instance.