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If you don’t currently like the people you are hiring, maybe you aren’t asking the right questions that represent you, your company and what you are looking for in an employee. I’m not quite sure I understand what your definition of “ruling out the weak ones” is, nor do I think that’s an appropriate attitude to have or term to use. Be sure that you are clear in the type of personalities you work well with, not just impressed with brand names and certifications. People can be trained, but usually you can’t change someone’s personality, motivation, or work ethic.