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Again it would be great if they didn't publish the answers.
And who is "they" exactly?
You would never get all of the publishers to agree to not publishing the Q&A. Even if somehow you did, someone else would come along and publish them.
That horse escaped from the barn a long, long time ago. The barn has since burned down, the horse has died, and yet some are still beating on it.
Agreed.
The "close the question pool" idea seems to come up regularly, without any regard to how practical it would be to implement. Here are the facts:
1) The ARRL VEC alone has almost 30,000 VEs, not to mention W5YI and about a dozen other VECs. How would you keep the answers secret among a group of people that large?
2) We can't close the pool by going back to an FCC-based examination system because the FCC has no money to do that. None. And there's no reason to believe they would get the money in the future. And if by some miracle the FCC did reinstitute in-house amateur exams, there'd be a hue and cry from the amateur community when the number of test sites and sessions were reduced by a factor of, what, 100?
3) As W3WN pointed out, even if there were some way to close the pool and keep the examiners from leaking it, some enterprising ham would pull a Dick Bash and collect/publish questions and answers.
If you want to make the tests tougher, urge the NCVEC to make the question pools larger. Anything else is just pointless venting.