That's true. I don't think we'll be able to have a completely foolproof plan; it's entirely a question of probabilities and likelihoods.

[Diana frowns for a moment. She is trying to think the best of the people here, but can't help but think about what she'd heard about the dragon's blood and its relation to the maddening mist. Are the Knightryders really trustworthy?

She'll have to hope.] Perhaps they could do an interview to find those in the ranks most likely to approve of cooperation with their counterparts? Assuming they do checks on the people who join, like you say, this should theoretically be an easy thing to determine.