Background Check Basics: Everything You Need to Know Before You Start
Whether you're a first-time employer, a landlord screening applicants, or an individual checking your own record, understanding the foundations of the background check process prevents costly mistakes and ensures you get accurate, useful information.
The Three Questions Every Background Check Answers
Every background check, regardless of complexity, ultimately answers three questions: (1) Is this person who they claim to be? — identity verification using SSN trace, government ID verification, and cross-referencing database records; (2) Do they have a relevant history? — criminal records, civil judgments, regulatory sanctions, and license verifications appropriate to the position or transaction; (3) Do their credentials check out? — employment history, education degrees, professional licenses, and professional references.
Background Check vs. Background Investigation: Key Distinction
A background check is a database-driven search — quick, inexpensive, automated, and focused on verifying information against existing records. A background investigation involves active research — interviewing references, reviewing financial records, conducting surveillance, and researching social media — typically used for security clearances, senior executive hiring, or legal proceedings. Most employment and tenant screening involves background checks, not investigations. Understanding this distinction sets realistic expectations for what a $20 database check can and cannot reveal.
What Information You Need to Provide (or Collect) for a Background Check
| Data Point | Why It's Needed | Required? |
|---|---|---|
| Full legal name (including middle name) | Primary search key; reduces false positives | Yes |
| Date of birth | Differentiates people with the same name | Yes |
| Social Security Number | SSN trace establishes address history; required for credit check | For most checks |
| Current and previous addresses (7–10 years) | Determines which county and state courts to search | Strongly recommended |
| All former legal names / aliases | Catches records filed under maiden name or previous identity | Strongly recommended |
| Written consent | FCRA requires signed authorization before conducting a check | Yes (FCRA-covered checks) |
Choosing the Right Background Check for Your Purpose
Employment (general): County criminal search (all counties lived in, 7 years) + SSN trace + national criminal database + federal PACER search + sex offender registry + education/employment verification. Employment (finance/fiduciary): Add credit report (FCRA permissible purpose), FINRA BrokerCheck, OIG exclusion check. Employment (working with children/vulnerable adults): Add FBI fingerprint check + state fingerprint check (mandatory in most states for these roles). Tenant screening: Criminal check + eviction records (UD court filings) + credit report. Volunteer screening: Criminal check + sex offender registry; fingerprint required for many youth organizations.
Turnaround Times: Realistic Expectations
| Check Type | Typical Turnaround | Common Cause of Delay |
|---|---|---|
| National criminal database | Minutes–hours | No common delays (automated) |
| County court search (online county) | 24–48 hours | Backlog on court portal updates |
| County court search (manual/in-person county) | 3–10 business days | Court clerk volume |
| Employment verification | 2–5 business days | HR department responsiveness |
| Education verification | 2–5 business days | School registrar backlog |
| FBI fingerprint (ChannelService) | 24–72 hours | Fingerprint quality issues |
| International check | 1–4 weeks | Foreign agency processing time |
Red Flags in Background Check Results — and How to Evaluate Them
A result is not automatically disqualifying. The EEOC's 2012 guidance on criminal records requires employers to conduct an individualized assessment considering: the nature and gravity of the offense, the time passed since conviction, and the nature of the job. A 10-year-old misdemeanor shoplifting conviction is not relevant to a software development role. A recent financial fraud conviction is directly relevant to a bookkeeper role. Document your reasoning. For housing, the same logic applies: HUD guidance (April 2016) warns that blanket "no criminal record" policies may constitute illegal discrimination under the Fair Housing Act. Evaluate each case individually and document why the specific record is or is not relevant to the specific tenancy.
Frequently Asked Questions
What information do I need to start a background check?
At minimum you need the subject's full legal name and, ideally, their date of birth, Social Security number (for permissible consumer reports), and last known address to narrow results and reduce false matches.
Where do I find free criminal records?
Official sources include state court e-filing portals, county clerk websites, the DOJ's National Sex Offender Public Website, and the BOP inmate locator. Use the links on our Background Checks Basics page for each state.
What is the difference between a national criminal database search and a county court search?
National criminal databases aggregate records from many sources but may miss recent filings or counties that do not contribute data. A county court search queries the court's own live docket and is generally more current and complete.
Can I run a background check on myself?
Yes. Self-checks are legal and do not affect your credit score. You can request your own consumer file from major CRAs and search public court records, sex-offender registries, and property databases freely.
What is an SSN trace and why is it used in background checks?
An SSN trace uses a Social Security number to identify all names and addresses historically associated with that number, helping screeners discover aliases, name changes, and additional jurisdictions to search.