[Tony takes the cue and stays silent (for once). He frowns when Steve brings up the past, because he instinctively wants to cut in. But now isn't the time to get defensive over things that aren't in front of them now.]

Right, we need a plan. The only problem is that we don't know most of these people so there's no sure way of telling they are who they say they are. You could question me and Carol, but the others will be a lot harder to be sure of.

[He rubs the bridge of his nose, trying to focus.]

We'll have to check. Regularly and genetically by someone we can trust.