Why do we have to surrender all the water before entering the airport even if we prove that is in fact a drinking water by taking a sip?

Question

But once inside the airport terminal, we can always buy some water and no one will check anymore if you bring the water inside the plane.

In: 974

Answer 1

There was a case where border officers forced a teen to drink from a bottle to prove its harmless content. Bottle was filled with drugs.
Guess they want to avoid that here in the US.

[Drugs in bottle](https://youtu.be/DkVm76c880U)