Generally, there are three situations: 1, the resume is fraudulent, and the candidate's resume fraud will lead to the failure of the background investigation. It is understandable if only a little change is made, but if the information is changed in a large area, the background investigation will fail. 2. If the candidate does not cooperate with the background investigation, the candidate is not authorized to agree to the background investigation, and the background investigation cannot be conducted and passed. 3. Provide false reference contact information. Candidates ask friends to pretend to be referees and provide false contact information of referees, which will also make it impossible to provide ringtones.