Vet or not, I've had spies repeatedly steal from the same city. Multiple spies have stolen from the same city on the same turn. After each theft, it gets tougher and tougher - your spies are going to fail often and you just loose them. Of course, your chances are better if you steal anything rather than going after a specific tech.
And on the prevention side, three spies in a city, preferably vets, foil most enemy espionage attempts.
And on the prevention side, three spies in a city, preferably vets, foil most enemy espionage attempts.
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