CML Practice Test

Locksmiths who hold the CPL credential take the CML examination by completing 9 additional electives through ALOA Security Professionals Association, Inc. This page provides free practice questions to support your preparation across technical subjects. You can test your knowledge, review question mechanics, and inspect official testing policies covering pen-and-paper testing at ALOA events, online third-party sites, and remote webcam proctoring.

CML Exam at a Glance

What changed for CML in 2026

• Nov 2, 2026: Delivery changed to In-person pen-and-paper at ALOA events, online at third-party test sites, or online via remote webcam proctoring (previously Online at third-party test sites, remote webcam proctoring, or pen-and-paper at ALOA events).^[1]
• Nov 2, 2026: Eligibility changed to CPL certification plus 9 additional electives (previously CPL first, then 9 more electives).^[1]
• Nov 2, 2026: Number of questions (elective exam) changed to 25–40 questions per elective exam (previously 25–40 questions per elective).^[1]

What the CML is and how it works

According to ALOA Security Professionals Association, Inc., “Each elective contains between 25 and 40 questions, depending on the subject covered.”^[1]

The CML credential, administered by ALOA Security Professionals Association, Inc., validates advanced locksmithing knowledge across specialized disciplines. To qualify for CML status, candidates must hold CPL certification and pass 9 additional electives. Each elective exam contains between 25 and 40 questions, depending on the subject covered.

Candidates can complete elective exams through multiple testing formats. Testing is offered as pen-and-paper examinations at ALOA events, including the annual convention, local association meetings and classes, ALOA headquarters in Dallas, or anywhere a test sitting is requested and standards are met. Candidates may also test online at third-party test sites or online via remote webcam proctoring.

Testing fees depend on association membership and the number of electives taken. ALOA or SAVTA members pay $150 for up to 9 electives, while non-members pay $195 for up to 9 electives. For candidates taking less than 9 electives, individual electives cost $25 each for ALOA or SAVTA members and $35 each for non-members. In-person testing is scheduled during the 2027 ALOA Convention & Security Expo from July 11, 2027 to July 17, 2027, with registration opening in Spring 2027. Because scoring cutoffs and retake policies vary, candidates should consult ALOA directly for specific administrative rules.

Worked examples: how to reason through CML questions

These are practice questions written for this site, not questions from the real exam. Each explanation shows why the right answer is right and why the others are wrong.

Example 1

Question: What is the function of the control lug on a removable-core (BEST-type) cylinder?

1. It locks the core to the housing when a regular key is used
2. It retracts when the control key is inserted, allowing the core to be removed from the housing
3. It prevents the plug from rotating more than 180 degrees
4. It engages the cam to operate the locking bolt

Answer: B. It retracts when the control key is inserted, allowing the core to be removed from the housing

Explanation:

Option B is correct because the control lug retains the core inside the cylinder housing during everyday operation. Inserting and rotating the dedicated control key turns the control sleeve, which retracts this lug flush with the core body and permits extraction without dismantling hardware.

Option A is incorrect because regular operating keys turn the plug while the lug remains stationary in its locking groove. Option C is incorrect because plug rotation limits are determined by internal stops or tailpiece design rather than the lug restricting travel beyond 180 degrees. Option D is incorrect because the plug or throw member drives the cam to throw the bolt, not the retaining lug.

Remember that operating keys shear at the plug line to manipulate the bolt, whereas control keys shear at the control sleeve to retract the core retention lug.

Example 2

Question: A Grade 1 commercial lockset, per ANSI/BHMA standards, is rated for a minimum of how many cycles?

1. 100,000 cycles
2. 250,000 cycles
3. 500,000 cycles
4. 1,000,000 cycles

Answer: C. 500,000 cycles

Explanation:

Option C is correct because ANSI/BHMA standards require a Grade 1 commercial lockset to withstand a minimum benchmark of 500,000 operational cycles under rigorous mechanical testing.

Option A is incorrect because 100,000 cycles corresponds to basic test parameters for lighter-duty hardware or residential requirements rather than heavy commercial installations. Option B is incorrect because 250,000 cycles represents standard performance thresholds for intermediate-duty commercial hardware. Option D is incorrect because 1,000,000 cycles exceeds the base 500,000 cycle certification requirement specified for this standard grade.

As a general rule, commercial hardware ratings establish clear durability expectations: Grade 1 locks must meet the rigorous 500,000 cycle baseline for high-frequency institutional and commercial openings.

Example 3

Question: An access-controlled door reports 'Door Held Open Too Long' repeatedly during business hours. What is the most appropriate corrective action?

1. Replace the door closer
2. Adjust the door-held-open timer in the access control software to match operational needs
3. Disable the alarm for that door permanently
4. Reprogram all cardholder credentials

Answer: B. Adjust the door-held-open timer in the access control software to match operational needs

Explanation:

Option B is correct because repeated door-held-open notifications during regular business hours typically indicate that legitimate pedestrian traffic or deliveries require more time than the default system parameter allows. Modifying the software timer aligns system monitoring with operational realities while preserving essential breach supervision.

Option A is incorrect because mechanical hardware replacement does not address software-enforced duration settings when closers function normally. Option C is incorrect because permanently silencing alarms introduces severe security vulnerabilities by blinding operators to propped entrances. Option D is incorrect because credential records govern individual badge access permissions rather than portal duration monitoring.

Remember that nuisance alarms should be resolved through administrative timing parameters to maintain physical security integrity without causing alarm fatigue.

How to use these practice tests

Preparation Strategy

Preparing for the CML credential requires selecting and completing 9 electives beyond your CPL certification. Because each elective contains between 25 and 40 questions, you should structure your study around individual technical categories.

• Review Core Fundamentals: Begin with foundational sets like CML Lock Mechanisms & Hardware and CML Keying Systems & Key Control to ensure mechanical accuracy.
• Target Chosen Electives: Focus your review on your specific elective areas, such as CML Safe & Vault Servicing, CML Access Control & Electromechanical Systems, or CML Automotive Locksmithing.
• Consult Official Texts: Pair each practice session with official technical manuals and manufacturer reference guides recommended by ALOA to reinforce theoretical principles.
• Simulate Exam Conditions: Answer practice questions without external references to adapt to testing pacing before your scheduled pen-and-paper or online proctored exam.

Sources & last verified

1. ALOA Security Professionals Association, Inc. — number of questions, delivery, eligibility (official source). “Each elective contains between 25 and 40 questions, depending on the subject covered.” Verified Nov 2, 2026 · source checked Oct 23, 2026.
2. drive.google.com — exam fee (official source). “CPL & ICPL (choose up to 12 electives). CML & ICML (choose up to 9 electives). CMAL. CMEL, CFL ALOA / SAVTA Member $150 Non-ALOA…” Verified Nov 2, 2026.
3. ALOA Security Professionals Association, Inc. — testing window, registration opens (official source). “July 11, 2027 - July 17, 2027 Donald E. Stephens Convention Center and Hyatt Regency O’Hare Chicago, Rosemont, Illinois Join us for five days of…” Verified Nov 2, 2026 · source checked Oct 28, 2026.

How we verify: editorial & fact-checking policy. Report an error: contact us.