- CADC-II Exam Structure at a Glance
- Domain 1: Scientific Principles of Substance Use and Co-Occurring Disorders (25%)
- Domain 2: Evidence-Based Screening and Assessment (20%)
- Domain 3: Evidence-Based Treatment, Counseling, and Referral (30%)
- Domain 4: Professional, Ethical, and Legal Responsibilities (25%)
- Why Domain Weighting Should Drive Your Study Order
- Mapping the Domains to a Study Timeline
- Registration, Fees, and Test-Day Mechanics
- Frequently Asked Questions
- The CADC-II exam has four domains; Evidence-Based Treatment, Counseling, and Referral carries the most weight at 30%.
- The exam is 150 multiple-choice questions (125 scored, 25 unscored) delivered in a three-hour Prometric session.
- Passing requires a scaled score of 500 on the IC&RC 200-800 scale, not a raw percentage correct.
- Combined exam and application-review fees total $339 for CCAPP members or $648 for non-members.
CADC-II Exam Structure at a Glance
The Certified Alcohol and Drug Counselor II (CADC-II) credential, issued through CCAPP Credentialing, uses the IC&RC Alcohol & Drug Counselor (ADC) examination administered on Prometric's network through ISO-Quality Testing (IQT). Every candidate sits for the same closed-book, computer-based test: 150 multiple-choice items, of which 125 are scored and 25 are unscored pretest questions you cannot distinguish from the rest. You get three hours to finish, and you'll need approved identification plus your admission letter to sit for the exam.
Unlike a percentage-based cutoff, the ADC exam reports a scaled score on IC&RC's 200-800 range, and you need a 500 to pass. That distinction matters for how you interpret practice results - a raw score of "80% correct" on a practice set doesn't map directly to the scaled system. For a full breakdown of how scoring works, see our CADC-II Passing Score guide.
The exam content is organized into four domains defined by IC&RC's ADC blueprint (effective November 2022, with general candidate guidance updated April 2025). Knowing exactly what each domain tests - and how much of the exam it represents - is the single most efficient way to allocate your study hours.
Domain 1: Scientific Principles of Substance Use and Co-Occurring Disorders (25%)
This domain covers the foundational science behind addiction and mental health conditions that frequently accompany it. Expect questions that test your understanding of how substances act on the body and brain, how tolerance and withdrawal develop, and how co-occurring psychiatric conditions interact with substance use disorders.
Core content in Domain 1
Candidates must be able to apply, not just recall, the biological and psychosocial models behind substance use.
- Pharmacology of major drug classes: depressants, stimulants, opioids, hallucinogens, and cannabinoids
- Neurobiology of addiction, including reward pathways and the physiology of craving
- Co-occurring disorder patterns: how mood, anxiety, trauma, and psychotic disorders present alongside substance use
- Risk and protective factors across biological, psychological, and social domains
- Withdrawal syndromes and the clinical signs that indicate medical risk
Because this is a knowledge-heavy domain, it rewards early, steady review rather than last-minute cramming. If you're mapping out a broader plan, our CADC-II Study Guide walks through how to sequence this content against the other three domains.
Domain 2: Evidence-Based Screening and Assessment (20%)
Domain 2 tests your ability to gather, interpret, and act on clinical information. This isn't about memorizing a single instrument - it's about knowing when and how to use validated screening and assessment tools appropriately within a treatment episode.
Core content in Domain 2
- Selecting appropriate screening tools for substance use, mental health, and risk (including suicide/self-harm)
- Conducting comprehensive biopsychosocial assessments
- Interpreting assessment data to inform diagnostic impressions and level-of-care decisions
- Documenting findings in a way that supports treatment planning and continuity of care
- Recognizing cultural, linguistic, and developmental factors that affect assessment accuracy
Exam items in this domain are frequently scenario-based: you're given a client vignette and asked to identify the next appropriate assessment step. Practicing with realistic case scenarios - rather than flashcards alone - is the most effective preparation strategy here.
Key Takeaway
For Domain 2, practice answering "what do you do next" scenario questions rather than only memorizing tool names - the exam tests application, not recall.
Domain 3: Evidence-Based Treatment, Counseling, and Referral (30%)
This is the largest domain on the CADC-II exam and the one most closely tied to day-to-day counseling practice. It covers treatment planning, individual and group counseling techniques, case management, and the referral process when a client needs services outside your scope.
Core content in Domain 3
Because this domain accounts for nearly a third of the exam, mastery here has an outsized effect on your overall score.
- Collaborative, client-centered treatment planning and goal-setting
- Evidence-based counseling approaches: motivational interviewing, cognitive-behavioral techniques, and relapse prevention strategies
- Group facilitation skills and group process dynamics
- Case management, coordination of care, and appropriate referral to higher or lower levels of care
- Family and support-system involvement in the recovery process
- Crisis intervention and relapse response planning
Because Domain 3 is weighted so heavily, candidates who treat it as "just another section" often underperform on the exam overall. If you're trying to gauge how much this domain will affect your odds of passing, the How Hard Is the CADC-II Exam? guide breaks down where most candidates lose points.
Domain 4: Professional, Ethical, and Legal Responsibilities (25%)
Domain 4 tests the regulatory, legal, and ethical framework that governs substance use counseling practice. This includes confidentiality law, mandated reporting, scope of practice, and the ethical obligations counselors carry toward clients, colleagues, and the profession.
Core content in Domain 4
- Confidentiality requirements and their limits, including mandated reporting obligations
- Professional boundaries and dual-relationship risks
- Scope of practice and appropriate referral when issues exceed competence
- Documentation standards and record-keeping requirements
- Ethical decision-making frameworks for resolving conflicts of interest
This domain connects directly to ongoing certification maintenance. CCAPP requires 50 continuing-education hours every two years to renew, including nine hours specifically in ethics and confidentiality - a strong signal that ethical competence isn't a one-time test requirement but an ongoing professional expectation. Understanding this domain thoroughly also pays off well beyond exam day, since ethical missteps are among the most common reasons practicing counselors face licensing complaints.
Why Domain Weighting Should Drive Your Study Order
Looking at the four domains side by side makes the priority order clear:
| Domain | Weight | Approx. Scored Questions* |
|---|---|---|
| Evidence-Based Treatment, Counseling, and Referral | 30% | ~38 |
| Scientific Principles of Substance Use and Co-Occurring Disorders | 25% | ~31 |
| Professional, Ethical, and Legal Responsibilities | 25% | ~31 |
| Evidence-Based Screening and Assessment | 20% | ~25 |
*Approximate distribution based on 125 scored items across the stated domain weights; actual question counts per candidate may vary.
Notice that three of the four domains are within striking distance of each other (30%, 25%, 25%), while only Domain 2 is meaningfully lighter at 20%. That means a balanced study plan - with a slight tilt toward Domain 3 - will serve most candidates better than concentrating on one or two domains and skimming the rest.
Mapping the Domains to a Study Timeline
Once you know the weighting, the next question is sequencing. A simple, domain-aware approach works better than a generic study calendar because it lets you spend more total hours on Domain 3 without neglecting the others.
Foundations: Domain 1
- Review pharmacology and neurobiology of major drug classes
- Study co-occurring disorder presentations and risk/protective factors
Assessment skills: Domain 2
- Practice matching screening tools to client scenarios
- Review biopsychosocial assessment components and documentation
Deep dive: Domain 3
- Study counseling modalities: motivational interviewing, CBT, relapse prevention
- Work through treatment-planning and referral scenario questions
- Review group facilitation and case management principles
Ethics and law: Domain 4
- Review confidentiality regulations and mandated reporting rules
- Study scope-of-practice and ethical decision-making scenarios
Integration and full-length practice
- Take timed, mixed-domain practice sessions on the practice platform
- Revisit weak domains identified from missed questions
Notice Domain 3 gets two full weeks rather than one - a direct reflection of its 30% weight. For a more detailed week-by-week plan with daily targets, see the full CADC-II Study Guide.
Registration, Fees, and Test-Day Mechanics
Understanding the domains is only half the picture - you also need to understand how the exam is administered and paid for, since eligibility errors are a common cause of delayed test dates.
- Testing provider: Prometric, scheduled through ISO-Quality Testing (IQT)
- Format: Closed-book, computer-based; 150 questions (125 scored, 25 unscored) in three hours
- Fees: $174 exam fee for CCAPP members or $338 for non-members, plus a separate application-review fee of $165 or $310 respectively - combined totals of $339 (members) or $648 (non-members), before training costs
- Prerequisites: 315 hours of approved alcohol/drug education, a 255-hour supervised practicum, and 6,000 total supervised experience hours (including the practicum), along with required verification and ethics commitments
- Identification: Approved ID and your admission letter are required at check-in
A full cost breakdown, including renewal fees, is covered in CADC-II Certification Cost 2026, and the eligibility requirements above are explained in more depth in our CADC-II Requirements guide. If you're still confirming scheduling windows and application deadlines, check CADC-II Exam Dates 2026 before locking in a study timeline.
Once certified, maintaining the credential requires 50 continuing-education hours every two years, with nine of those hours specifically in ethics and confidentiality - directly reinforcing the content tested in Domain 4. Renewal costs $150 for members or $400 for non-members.
If you want to see how the exam domains translate into the kinds of questions you'll actually face, working through full-length practice sessions on our CADC-II practice test platform is the most direct way to test your domain-by-domain readiness before exam day. Reviewing missed questions by domain - rather than just tracking an overall score - will show you exactly where to focus remaining study time. For context on how challenging candidates generally find each domain, How Hard Is the CADC-II Exam? is a useful companion read, and CADC-II Pass Rate 2026 covers what's publicly known about outcomes.
Frequently Asked Questions
There are four domains: Scientific Principles of Substance Use and Co-Occurring Disorders (25%), Evidence-Based Screening and Assessment (20%), Evidence-Based Treatment, Counseling, and Referral (30%), and Professional, Ethical, and Legal Responsibilities (25%).
Many candidates start with Domain 1 (Scientific Principles) because it builds the conceptual foundation for later domains, then move into Domain 3 (Evidence-Based Treatment, Counseling, and Referral) since it carries the most exam weight at 30%.
No. The exam uses a scaled score on IC&RC's 200-800 range, and you need a 500 to pass. It is not a simple percentage of questions answered correctly.
The exam is 150 multiple-choice questions - 125 scored and 25 unscored - administered as a closed-book, computer-based test over three hours through Prometric via ISO-Quality Testing (IQT).
No. Since Evidence-Based Treatment, Counseling, and Referral is worth 30% of the exam versus 20% for Evidence-Based Screening and Assessment, allocating more study time proportionally to the higher-weighted domains is a more efficient strategy.