From MWCSWiki

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• Our stance on Roy & McCallum's active learning algorithm

The reason we're not going to use poison keywords in the Cat Builder process:

• The examples have something in common. But the cex's don't. Therefore it's unlikely that we're going to get a particular keyword very prevalent in the cex's, so it seems fruitless to pursue them.
• There are just so stinking many possible poison keywords, how would you know which ones to test?!