Ex Cargo Clown - Airside isn't sterile. No addition or removal of toothpaste will change that. Why take the chance? Well there are so many possibilities with the current status quo, that the "chances" are huge of anything. Whether pilots take liquids and gels with them will not affect that. Why do you take the chance when you go up and down stairs? Why not build everything flat? The fact of the matter is more people kill themselves falling downstairs than from explosive toothpaste, so to be honest, why not take the risk?
Fingerprint detectors are not the answer, you need more than 1 identification. Also for instance, part of the suggested fingerprint ID might be to have the fingerprint detector driver visually check your finger tip.
The facts of the matter are that if we are trusted to sit in a flightdeck, sometimes on our own, we don't need any disguised nasties to commit terrible crimes. If you trust us not to damage the aircraft when we leave it, then we should be trusted not to take nasties to give to other people. The same is true of some other groups of staff too.