According to the U.S. Department of Labor, the price of a bad hire is at least 30 percent of the employee's first-year earnings. For a small company, a five-figure investment in the wrong employee is a threat to the life of the business. In many ways, a bad hire's effect on company culture echoes beyond the employee's tenure. Poor performers lower the standards for other employees, and bad habits spread like wildfire. Unfortunately, bad hires are not always easy to spot. While we all may say that past behavior is the best indicator of future behavior, we don’t act as if we believe this when we are interviewing candidates—often because we aren’t confident how to ask questions that will tell us about past performance.