Bug 465369

There are some people who appeared in older photos - I want to have them tagged, but I know I'll never have any new photos with these people. It is quite annoying when I do a "Recognise faces" run and a lot of the pictures get tagged with people I _know_ cannot possible be in the photos. I could help the facial recognition be much much more accurate if I could tell it which pool of people to search within.
Would it be possible to somehow exclude specific people (or better yet groups of people) when doing a "Recognise faces" run? Best would be if people could be tagged, and then groups of people could be excluded. e.g. all "pre-2000" people or "dads-school-friends" people, or even both of those groups...