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Problem is, if you're checking out a brand new domain that hasn't been crawled yet (which many people who are trading links will have) then it'll show a failure.
You could maybe do a whois query and look up the registered date of the domain, and if it's been around a while and still hasn't been indexed, that'll increase the chances that it's actually banned.
Also, checking for non-existant pagerank can add to the formula.
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