i like the style/approach of your questions--a nice optimum that minimizes false positives and false negatives. and i agree with you that threshold competence

i like the style/approach of your questions--a nice optimum that minimizes false positives and false negatives. and i agree with you that threshold competence in the general applicant pool is so low that some form of technical screening is absolutely essential. My problem is how best to do it. For one thing, it has taken me far too long to recognize that the pool of interview questions and plausible answers are widely available and apparently studied by many applicants prior to technical onsite interviews. Their answers are quickly given and so polished that we bring them on, then fairly soon find that answers to those interview questions is pretty much all they know.