“Officials had surreptitiously placed different bomb components in the check-in luggage of nine passengers to see if security screeners would spot the contraband.”
Catch the ball Johnny, oooppps, oooppps, ooopps....
I guess this is like the old coffee commercial. "We've secretly switched Bob's regular coffee with C4. Let's see if he notices the difference". What's next, planting cocaine in the luggage?