The government runs a tight ship when it comes to drug usage. Drugs can alter your state of mind, impact your judgment, and make you more susceptible to coercion. Unlawful drug use further suggests an unwillingness to comply with laws, rules, and regulations. This applies to drug use in the past as well as the present. Prior drug use frequently appears on Statements of Reasons (SORs), in fact, and can result in clearance denial or revocation—even for applicants not using currently.

Many, if not most applicants fail to mitigate their history of illegal drug involvement. Even so, we do see applicants successfully obtain or maintain their security clearance despite prior illegal drug use. Successfully overcoming Guideline H concerns requires a sophisticated understanding of how the government views drug involvement and a holistic mitigation strategy.

Guideline H, Drug Involvement

Under Guideline H, Drug Involvement, both current and past illegal drug use presents security concern. Illegal drug use at any time raises questions about your judgment, trustworthiness, reliability, and integrity. Past failure to comply with the law suggests a potential future failure to comply with the law. Those possessing a security clearance are required to be responsible and reliable on the job and off. Abstinence from illegal drugs, including marijuana, is expected of all occupying a sensitive position, whether they are clocked in, on duty, or not.

Most Guideline H concerns related to prior drug use are flagged during the initial security clearance application process. This is difficult to mitigate but not impossible with a proactive and comprehensive strategy.

Far trickier to mitigate is past drug use that only comes to light later, after receiving a clearance. We see this when applicants undergo the more extensive investigation required for a higher level of clearance. They initially failed to report past drug involvement during the Confidential application, only for that drug use to come back and haunt them during the Top Secret application. This presents a particular challenge because the Guideline H concern for the drug use itself is compounded by a Guideline E, Personal Conduct concern for lack of candor during the security clearance process. The irony is that mitigating the drug use from the beginning would have been far less difficult.

Overcoming Past Drug Use

The government has a strict drug-free policy for federal employees, military, and those in sensitive positions. This does not mean you have no chance of obtaining a security clearance if you have a history of illegal drug involvement, but you will have to thoroughly mitigate the government’s concerns. The burden of proof falls on you, the candidate. You must demonstrate that you present no security risk, and that your past drug involvement does not make you any less trustworthy or reliable.

Adjudicators consider several factors when determining whether your prior drug use warrants denial or revocation of your security clearance.

• When the usage occurred and the duration of abstinence since the last usage;
• The frequency, duration, and context of use;
• How the government became aware of the usage (proactive affirmative disclosure, disclosure in anticipation of being caught, failing a drug test, etc.);
• Whether you voluntarily sought evaluation, counseling, or other treatment;
• Whether you possessed a clearance at the time of your use; and,
• Whether you intend to continue misusing any drugs.

Obviously, getting caught using drugs while possessing a clearance is the worst-case scenario, especially if you had an opportunity to self-report prior to getting caught. A close second, however, is failing to disclose current or prior usage when asked during the application. Your lack of candor indicates that you might fail to comply with reporting requirements, potentially endangering national security interests as a result. In most cases, you are far better off being candid and proactive when reporting drug involvement, rather than waiting for the government to bring the issue to you. A Guideline E, Personal Conduct violation on top of another violation is incredibly difficult to overcome.

Prior “Legal” Marijuana Use

A common pitfall we see is applicants who use state-legal marijuana under the mistaken belief that it is federally legal. Some form of marijuana is legal in most states, but in all fifty states marijuana is a federally controlled substance. This has not changed since President Donald Trump’s December 2025 executive order, nor the Justice Department’s April 2026 rescheduling order. Recreational marijuana remains a Schedule I substance in 2026.

Many clearance holders are unaware of the conflict between federal and state law, and put their clearance in jeopardy. Adjudicators do take genuine ignorance of the law into account, but only if the applicant successfully demonstrates their sincere intent to comply with federal laws going forward, and has abstained from marijuana for a sufficient period of time.

The most effective strategy for mitigating past drug use will differ between cases. Adjudicators consider drug use in a larger context and utilize a whole-person analysis. Depending on the circumstances surrounding your past drug use, some mitigating strategies will be more effective than others. In general, abstaining from unlawful or irresponsible drug use for an extended period before beginning the application process is best. If you have recent or extensive drug use in your past, a conversation with a national security attorney can help you make an informed decision of whether the security clearance process is worth it for you personally, and what overcoming your prior drug use may realistically require.

Tully Rinckey attorneys understand that issues involving security clearances and drug use can be challenging, and they will handle your matter with the attention and tact it deserves. If you have additional questions, our team of dedicated security clearance attorneys is available to assist you today. Please call 8885294543, or schedule a consultation online.

Allison is a Partner with Tully Rinckey PLLC’s Buffalo office, where she focuses her practice on all aspects of military and national security law. She represents clients at all levels of military criminal law from investigations to adverse actions and separation boards all the way to courts-martial and appeals to the service courts and the Court of Appeals for the Armed Forces. She is also a member of the National Security Lawyers Association (NSLA) and provides security clearance representation at all stages of the vetting process.