A DHS security clearance is a federal determination that you’re trustworthy enough to access classified information or hold a sensitive position with the Department of Homeland Security or one of its contractors. You cannot apply on your own. A DHS component or a contractor working on a DHS mission has to sponsor you for a specific role, and the clearance is tied to that role. From there, the investigation, adjudication, and ongoing monitoring follow the same government-wide rules that apply across federal agencies.
Who Can Get a DHS Clearance
U.S. citizenship is the baseline for any classified clearance. Executive Order 12968 limits eligibility to U.S. citizens whose personal and professional history shows loyalty, trustworthiness, honesty, reliability, and sound judgment.1govinfo. Executive Order 12968 – Access to Classified Information Very rare exceptions exist for non-citizens with special expertise, granted at agency discretion for specific programs.2U.S. Department of State. Security Clearance FAQs
One distinction to sort out early: many DHS job postings mention Public Trust. That is not a security clearance.3USAJOBS Help Center. What Are Background Checks and Security Clearances Public Trust positions involve sensitive but unclassified duties and require a background investigation, but the forms, scope, and standards differ from a classified clearance. Non-citizens may be eligible for some Public Trust roles, though each agency sets its own policy.
Beyond citizenship, adjudicators look at your whole background to decide whether granting access is consistent with national security. The main areas they weigh:
- Criminal history, including arrests and charges regardless of whether records were sealed or expunged.
- Financial responsibility. Delinquent debts, bankruptcies, and tax issues are among the most common reasons for denial because they can signal vulnerability to coercion.
- Drug involvement, including marijuana and misuse of prescription medications.
- Foreign contacts, foreign financial holdings, and foreign travel.
- Personal conduct suggesting dishonesty, rule-breaking, or poor judgment.
No single issue is an automatic disqualifier. Adjudicators weigh seriousness, recency, and frequency against evidence of rehabilitation. Honesty during the process matters enormously. Concealing a problem is almost always treated more seriously than the underlying issue.
Sponsorship: Why You Can’t Apply on Your Own
The process starts when a DHS office or contractor identifies you for a position that requires a clearance or Public Trust determination. There is no way to walk in and request one for yourself. Your sponsor submits the request, and you then get instructions to complete the appropriate questionnaire. If a job listing you’re eyeing requires a clearance you don’t have, the path is to apply for the job; sponsorship comes with the position.
The Forms You’ll Complete
Which form you fill out depends on the sensitivity of the position:
- SF-85 for non-sensitive, low-risk positions.
- SF-85P for Public Trust positions involving sensitive but unclassified duties.4U.S. Office of Personnel Management. Standard Form 85P – Questionnaire for Public Trust Positions
- SF-86 for national security positions requiring Confidential, Secret, or Top Secret clearance.5Defense Counterintelligence and Security Agency. Help Filling Out Forms
You submit electronically through eApp, part of the National Background Investigation Services (NBIS) platform that has replaced the older e-QIP system.6Defense Counterintelligence and Security Agency. National Background Investigation Services (NBIS) Your sponsor provides login credentials and a code.
The SF-86 is long. Plan on several hours of gathering documentation before you sit down with it: roughly ten years of residential addresses, employment history, education records, and personal references. You must disclose foreign contacts, debts and bankruptcies, any arrests or charges, and any drug use.4U.S. Office of Personnel Management. Standard Form 85P – Questionnaire for Public Trust Positions Gaps and vague answers slow the process and raise red flags. Accuracy beats speed.
One warning. The government pays for your investigation. You will never be asked to cover the cost. Anyone charging you for a clearance is running a scam.
What the Investigation Involves
Once you submit your questionnaire, the Defense Counterintelligence and Security Agency (DCSA) runs the investigation. Contractor determinations for DHS also go through DCSA.7Department of Homeland Security. Contractor Fitness at DHS Depth scales with the clearance level. A Secret investigation is less intensive than a Top Secret single-scope background investigation.
Every investigation includes credit history and criminal record checks.8FBI. Security Clearances for Law Enforcement Investigators verify what you put on the questionnaire and look for anything left out. For higher-level clearances, they interview references, former employers, and neighbors. These are open-ended conversations about your character and reliability, not box-checking calls.
Polygraphs are not standard across DHS. They apply to specific roles rather than the whole department. Every law enforcement applicant for U.S. Customs and Border Protection must take a polygraph before hiring.9Office of the Law Revision Counsel. 6 USC 221 – Requirements With Respect to Administering Polygraph Examinations to Law Enforcement Personnel of U.S. Customs and Border Protection Other DHS components and intelligence community roles may require them too. A standard Secret clearance at most DHS offices does not.
How Long It Takes
Timelines swing widely based on clearance level, the complexity of your background, and current backlogs. As a rough benchmark, Secret-level investigations often take a few months. Top Secret investigations can run six months or longer. Extensive foreign travel, overseas residency, or financial issues that need follow-up will stretch things further.
If you need to start work before the full investigation finishes, interim clearances exist for that reason. DCSA’s Adjudication and Vetting Services reviews your SF-86 and other available information and may grant interim eligibility concurrently with the start of the investigation.10Defense Counterintelligence and Security Agency. Interim Clearances Interim access is not automatic. It’s granted only when the initial review indicates that access is clearly consistent with national security. If granted, it lasts until the full investigation is done and a final determination is made.
Drug Use, Including Marijuana
Drug involvement is one of the 13 adjudicative guidelines that apply to every federal clearance decision. Under Security Executive Agent Directive 4, any illegal use of a controlled substance, including marijuana, raises questions about reliability and willingness to follow rules.11Office of the Director of National Intelligence. SEAD 4 – National Security Adjudicative Guidelines This is where many applicants get tripped up. Marijuana remains a controlled substance under federal law, and state legalization does not change the clearance calculus.
Conditions that raise concern include any illegal drug use, drug possession or distribution, misuse of prescription medications, continued use after being granted a clearance, and expressing intent to keep using.11Office of the Director of National Intelligence. SEAD 4 – National Security Adjudicative Guidelines Past use does not necessarily end your chances. Adjudicators consider how long ago use occurred, how frequent it was, and whether you’ve shown a clear pattern of abstinence. A student who used marijuana a handful of times five years ago and stopped sits in a very different position than someone using regularly and recently.
The critical point: disclose honestly. Investigators will likely uncover past drug use through reference interviews anyway. Getting caught lying is far worse than the use itself.
If You Are Denied
If the adjudicator cannot make a favorable determination, you receive a Statement of Reasons. It’s a formal document explaining exactly which security concerns produced the unfavorable decision, organized by the specific adjudicative guidelines that apply — financial considerations, drug involvement, foreign influence, and so on.
You then have a limited window to respond in writing with evidence that mitigates the stated concerns. This is where you explain circumstances, show what has changed, and provide documentation: paid-off debts, completion of treatment, character references, whatever fits. You may also request a hearing before an administrative judge. The exact procedure depends on the agency and whether you’re a federal employee or a contractor, but the right to respond to the Statement of Reasons is standard across the federal clearance framework.
Take a denial seriously and respond thoroughly. Many initially unfavorable determinations are reversed on appeal when the applicant provides credible mitigation evidence. Consulting a security clearance attorney is worth considering, especially for Top Secret or SCI-level denials.
After You Are Cleared
Getting a clearance is not a one-time event. The federal government has moved from periodic reinvestigations, which used to happen roughly every five years for Top Secret and ten for Secret, to Continuous Vetting. This runs ongoing automated checks against criminal, financial, terrorism, and public records databases throughout your eligibility.12Defense Counterintelligence and Security Agency. Continuous Vetting When those checks generate an alert, DCSA assesses whether it warrants further investigation.
You also have your own reporting duties. Under SEAD 3, clearance holders must report certain events to their security office:13Office of the Director of National Intelligence. SEAD 3 – Reporting Requirements for Personnel With Access to Classified Information or Who Hold a Sensitive Position
- Foreign travel, work or personal, reported before departure when possible.
- Ongoing relationships with foreign nationals that involve bonds of affection or personal obligation, and any contact with someone suspected of working for a foreign intelligence service.
- Foreign property, business interests, investments, or financial accounts.
- Any arrest, regardless of whether charges were filed.
- Any illegal drug use or misuse of prescription medications.
- Changes in personal status such as marriage or divorce that could affect your clearance.
Failing to report is itself a security concern. Self-reporting is always better than having investigators discover it through automated checks.
Taking Your Clearance to Another Agency
If you leave DHS for another federal agency or a different contractor, you don’t automatically have to repeat the whole process. Under Security Executive Agent Directive 7, federal agencies must accept an existing background investigation and clearance adjudication from another agency. This principle is called reciprocity.14Defense Counterintelligence and Security Agency. DCSA Reciprocity Program The receiving agency must make a reciprocity determination within five business days of receiving the request.
There are limits. Reciprocity applies to the national security clearance itself. If the new agency requires a separate suitability or fitness determination, that runs independently and does not fall under the five-day rule.14Defense Counterintelligence and Security Agency. DCSA Reciprocity Program If your new role requires a higher clearance level than you currently hold, you’ll need a new investigation for the upgrade. For lateral moves at the same level, reciprocity spares you months of redundant processing.