SFC Ollie
Still Marching
From what I've read the saliva tests nearly mimic what the blood content is for a given substance that shows a positive result.
For weed it only shows the parent drug but what that means is if an instant saliva test comes back positive then the person is under the influence because that is proof it was smoked within two hours of the test.
Got a link? I'm certain that the Military and the Police would be interested in this test.