Dr. Frank's What's-it

Malaysian police have arrested some

Malaysian police have arrested some "suicide bombers."

It's in inverted commas because, though these guys claim to be part of a "suicide bombing squad," there is some doubt as to whether they're telling the truth.

So the "question" "is": how does an as-yet-unexploded "suicide" "bomber" establish his "bona" fides beyond a "reasonable" doubt? (Or perhaps that should be "the" question.)