I am often asked, "What is the one thing companies should do to make sure they hire only the best salespeople." My answer is typically - "Use a powerful multi-science sales aptitude personality test to ensure you have the right Behaviors, Motivators, Acumen, and Skills to hire the best salespeople possible."
I also recommend that crappy sales managers should never be allowed to hire crappy salespeople. Because crappy sales managers often hire losers. This is a universal truth.