Nothing's worse than getting to an interview and finding out that you know COBOL from the hiring manager reading it off your resume. The rest of the tips seem

Nothing's worse than getting to an interview and finding out that you know COBOL from the hiring manager reading it off your resume. The rest of the tips seem to be really sleazy, but are pretty surreptitious. However, wouldn't this be extremely obvious to both parties and be so blatantly unethical to end the recruiter's career?