Comment 2 for bug 1134428

And it gets more complicated than anticipated.

I assume we care about the real authors rather than the person who creates the merge proposal (it could be different people).
In that case there might be more than one author. Moreover these authors are usually identified by their mail address and full name. In some cases the mail is even missing:
------------------lp:unity-------------------------------------
revno: 3191 [merge]
author: Jacob Edwards
committer: Tarmac
branch nick: trunk
timestamp: Wed 2013-03-06 13:33:18 +0000
message:
  Add a 1s delay between hovering on a launcher icon and showing its tooltip.
  Further tooltips before clicking or unhovering launcher will appear instantly. Fixes: https://bugs.launchpad.net/bugs/929485.

  Approved by PS Jenkins bot, Stephen M. Webb, Marco Trevisan (Treviño).
------------------------------------------------------------

Given that I'm not really sure what to do. I can try to search for an e-mail (and fail if it doesn't exists) in launchpad to identify the launchpad id. And if any of the authors fail the screening the merge proposal would refuse to land.

We will probably hit some issues with this. When looking at lp:compiz there are branches where the author is <email address hidden> but such e-mail does not exist in launchpad anymore (OTOH it looks like he is not in the agreement group either).