Well I said destroy but that is not 100 % true.
If you fail the test they will not destroy it. They will keep it in the file. If you say nothing they will send your test results to the JAA.
the only thing you must do is tell them that they must not send your results to JAA.
That is private. They must honor your demand.
They will keep it in there own file but JAA will not know about it.
So you can retest yourself a few times but retest yourself at another AMC.