You should look for accreditation when choosing a background screening provider.  It proves a provider’s procedures are compliant with industry best practices and affirms industry knowledge and expertise.
To become accredited, consumer reporting agencies must pass a rigorous onsite audit, conducted by an independent inspector, of their policies and procedures as they relate to the following critical areas:

• Legal Compliance
• Consumer Protection
• Information Security
• Organizational Integrity and Ethics
• Ability to Train and Educate Clients
• Accuracy and Depth of Products
• Quality and Accuracy of Public Record Researchers and Background Specialists
• Employees’ Background Check Expertise