If you have been notified that you were not hired because of something in your background, you should see, in that same letter, information for disputing something in your background report. It’s important to follow up as soon as you get the letter. The window to have your dispute considered is normally five days. Your dispute will trigger an investigation into your claim and the employer will be notified immediately.
This depends on the organization’s own hiring policy. Some cities, counties, and states have specific guidelines for using criminal records in the hiring process and your employer will comply with those. However, a criminal record does not bar you from employment. Check with the company’s HR department for guidance and be honest about your situation. Employers tend to be more undrstanding if given accurate information.