The "fasten seat belt" sign is just advisory. You can still get up when it's on if you need to for whatever reason.
From FAR 121.317:
(f) Each passenger required by 121.311(b) to occupy a seat or berth shall fasten his or her safety belt about him or her and keep it fastened while the "Fasten Seat Belt" sign is lighted.
So, no.
Not surprised you didn't turn up positive on the test. I'm pretty sure those target specific high explosive substances that could be used in small amounts to bring down an airplane, and are not intended to detect common low-explosive propellants like gunpowder.
> As a pure unpaid contributor of source code you have no patent liability.
Unfortunately, that's not true. Actually, as an unpaid, noncommercial USER of a software product, you CAN have patent liability.
Patents extend to the right to control all development and use of derivative technologies whether commercially or noncommercially.
I believe you'll find that a government actor is held to an entirely different and much stricter legal standard than a private actor with respect to 4th amendment limitations.
1 Dog Pound = 16 oz. of Alpo