Often by modifying the candidates resume without asking.
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Example: I have a friend with lots of industry experience, who also happens to have a PhD. A recruiter removed the PhD info from his resume and submitted it to a company. After flying out and going through a half-day interview process a certain topic came up and he said "Oh, my Thesis topic was related to that" To which the manager said "Oh, we don't hire people with PhDs" and the interview was over.
Obviously there is plenty of stupidity to go around here, but recruiters regularly remove (or move to a 2nd page) things from resumes that they know would immediately disqualify a candidate and they do so without the candidates knowledge.
[edit]
Example: I have a friend with lots of industry experience, who also happens to have a PhD. A recruiter removed the PhD info from his resume and submitted it to a company. After flying out and going through a half-day interview process a certain topic came up and he said "Oh, my Thesis topic was related to that" To which the manager said "Oh, we don't hire people with PhDs" and the interview was over.
Obviously there is plenty of stupidity to go around here, but recruiters regularly remove (or move to a 2nd page) things from resumes that they know would immediately disqualify a candidate and they do so without the candidates knowledge.