Final answer:
References may not be reliable due to potential bias, as they are often favorable and selected by the candidates, which can distort the employer's perspective of the candidate's genuine qualifications.
Step-by-step explanation:
References are not always reliable for assessing an applicant's qualifications for a job primarily because references are likely to be biased. The individuals chosen to provide references are typically selected by the candidate themselves, and are often past employers, colleagues, or teachers who are inclined to give favorable reports. This bias can obscure a prospective employer's view of the applicant's true capabilities and work ethic. Furthermore, previous experience may not always be a strong indicator of performance in a different environment or job role.