Former paramilitaries, both republican and loyalist, were interviewed about their roles in the 40 years of violence which blighted Northern Ireland on the understanding that their accounts would not be made public until after their deaths.
But subsequent court rulings in the US have rendered that undertaking useless, as the PSNI were awarded custody of the tapes for investigative purposes.
Lesson:
No videos, no pictures and keep your mouth shut.
Situation:
Civillian shot by British soldier subsequently found to be unarmed.
Aye, a bit like Duggan was 'unarmed'.
There's always a reason; finding it may not be so easy.