The Drug Abuse Screening Test (DAST) is a short questionnaire designed to identify whether someone may have a problem with drug use. It uses simple yes-or-no questions to flag potential substance use issues, and the most common version, the DAST-10, takes only a few minutes to complete. Originally developed by psychologist Harvey Skinner and modeled after the well-known Michigan Alcoholism Screening Test, the DAST is now used across healthcare, social services, criminal justice, and workplace settings as a quick first step in identifying people who might benefit from further evaluation.
What the DAST Measures
The DAST screens specifically for drug use, not alcohol. That distinction matters because many people assume a substance abuse screening covers everything. If a provider wants to assess alcohol use, they’ll use a separate tool. “Drugs” in this context means any substance used outside of a medical prescription: recreational drugs, misuse of prescription medications, or use of over-the-counter drugs in ways they weren’t intended.
The tool doesn’t diagnose a substance use disorder. It identifies risk levels and signals whether a more thorough clinical assessment is warranted. Think of it as a filter, not a final answer.
The Three Versions
The original DAST contained 28 items, but researchers found that shorter versions performed just as well. The DAST-20 correlates almost perfectly (r = .99) with the original 28-item version, meaning it captures essentially the same information with fewer questions. The DAST-10 correlates at .98 with the DAST-20 and has strong internal consistency even as a brief scale.
Research comparing the DAST-20 and DAST-10 directly found their psychometric and diagnostic properties to be equivalent, suggesting that many of the extra items in the longer version add measurement error without improving accuracy. The DAST-10 is now the most widely used version in everyday screening, while the DAST-20 is sometimes preferred in clinical assessment and research settings where a broader picture of drug-related problems is useful.
The 10 Questions on the DAST-10
Every question on the DAST-10 is answered with a simple “yes” or “no.” The questions cover the past 12 months and address different dimensions of drug use, from physical consequences to social and legal impacts:
- Have you used drugs other than those required for medical reasons?
- Do you use more than one drug at a time?
- Are you always able to stop using drugs when you want to?
- Have you ever had blackouts or flashbacks as a result of drug use?
- Do you ever feel bad or guilty about your drug use?
- Does your spouse (or parents) ever complain about your involvement with drugs?
- Have you neglected your family because of your use of drugs?
- Have you engaged in illegal activities in order to obtain drugs?
- Have you ever experienced withdrawal symptoms (felt sick) when you stopped taking drugs?
- Have you had medical problems as a result of your drug use (e.g., memory loss, hepatitis, convulsions, bleeding)?
Two questions are scored in reverse. Question 3 (“Are you always able to stop using drugs when you want to?”) scores a point for answering “no,” while the rest score a point for “yes.” If you’ve never used drugs, the instructions guide you to answer “yes” to question 3 and “no” to question 5.
How Scores Are Interpreted
Each “yes” (or reversed “no”) adds one point, giving a total score between 0 and 10. The score falls into one of several risk categories:
- 0: No problems reported. No further action needed.
- 1 to 2: Low level of drug-related problems. Monitoring or brief counseling may be appropriate.
- 3 to 5: Moderate level. A more detailed assessment is typically recommended.
- 6 to 8: Substantial level. Intensive assessment and likely intervention are indicated.
- 9 to 10: Severe level. Intensive assessment is strongly recommended.
A score of 3 or higher is the commonly used threshold for recommending further evaluation. That doesn’t mean someone scoring a 3 has a substance use disorder. It means there are enough indicators to justify a deeper conversation with a professional who can make that determination.
How the Screening Works in Practice
The DAST-10 can be self-administered (you fill it out on paper or a tablet in a waiting room) or read aloud by a clinician, social worker, or other professional. Either way, it takes roughly five minutes or less. Its brevity is one of its biggest advantages. In busy primary care offices, emergency departments, or intake processes for social services, a 10-question yes/no screener is far more practical than a lengthy clinical interview.
The tool has been evaluated across diverse populations, including psychiatric patients, people in substance abuse treatment, and Latino drug users. All versions of the DAST consistently produce satisfactory measures of reliability and validity, making it one of the more well-established screening instruments in the field.
Limitations Worth Knowing
The DAST relies entirely on self-report, which introduces an obvious vulnerability: people can underreport or deny drug use. Research on the DAST found it was only moderately correlated with social desirability and denial, meaning these biases affect results to some degree but don’t completely undermine the tool’s usefulness. In settings where someone has strong motivation to minimize their drug use, such as custody evaluations or workplace screenings, the results should be interpreted with extra caution.
The screening also doesn’t distinguish between types of drugs. A person scoring a 5 could be misusing prescription painkillers, using methamphetamine, or both. The DAST identifies that a problem likely exists but tells you nothing about which substances are involved or how severe the pattern is. That’s why it’s a screening tool rather than a diagnostic one. The information it provides is a starting point, not a complete clinical picture.
Another practical limitation: the DAST asks about the past 12 months, so it won’t capture someone who had a serious drug problem two years ago but has since stopped. It’s a snapshot of recent behavior, not a lifetime history.