CFL Lock Identification & Key Systems 5

Question 1

A tubular (ace) lock, often found on vending machines, is identified by its circular keyway. The primary forensic concern with these locks is:

Accepted Answer

Inexpensive tubular lock picks or 7-pin tubular pick tools can open many in seconds

Answer

Widely available tubular lock pick tools can decode and open most standard tubular locks quickly, and the attack leaves minimal evidence compared to forced entry.

Question 2

The Abloy disc detainer lock is considered high security partly because it has no:

Accepted Answer

Springs in the locking mechanism

Answer

Abloy locks use rotating discs with no springs; without springs there is no binding when picking, making traditional pick techniques ineffective.

Question 3

A forensic locksmith is asked to determine if a lock was opened with the correct key or by manipulation. The presence of which evidence would MOST strongly support legitimate key use?

Accepted Answer

Consistent wear patterns on key cuts matching the lock's bitting

Answer

Consistent wear patterns on key cuts that exactly match the lock's bitting sequence indicate the lock was regularly operated by a properly cut key.

Question 4

In a restricted keyway system, the restriction is enforced through:

Accepted Answer

Patent protection and contractual agreements limiting blank availability to authorized dealers

Answer

Restricted keyway systems rely on patents and controlled distribution agreements to prevent hardware stores and unauthorized locksmiths from obtaining or duplicating blanks.

Question 5

Which feature of a high-security cylinder like ASSA Abloy or Mul-T-Lock makes traditional bump key attacks ineffective?

Accepted Answer

A secondary locking element (sidebar or rotating disc) requiring additional alignment beyond pin shear

Answer

Secondary elements like sidebars or rotating discs require a key to align a second set of security features beyond the primary shear line, which bump keys cannot activate.

(CFL) Certified Forensic Locksmith Practice Test

(CFL) Certified Forensic Locksmith Practice Test

CFL Lock Identification & Key Systems 5