geprüft in English:

It's an intriguing theory, but I don't see how it can be tested.

His policy was soon tested.

The pilots tested their guns.

The new drug will be tested in Vaxgen's laboratory.

I've already tested them.

Tom got his hearing tested.

I went to the hospital to have my eyes tested.

Dr. Patterson, a psychologist, has tested Koko's IQ.

The scientist maintained that the theory should be tested through experiments.

And the master of the banquet tested the water that had been turned into wine.

To borrow an argument from Karl Popper, a hypothesis is only of value if it can be tested.