CFL Lock Identification & Key Systems 2

Question 1

Which key system feature allows a single master key to operate locks that each have their own individual change key?

Accepted Answer

Master key system

Answer

A master key system uses a hierarchical bitting arrangement so one master key opens multiple locks, each operable by its own change key.

Question 2

A forensic locksmith examining a lock finds witness marks on the plug face consistent with a thin metal strip inserted above the keyway. This technique is best described as:

Accepted Answer

Loiding

Answer

Loiding (slip-knifing) involves inserting a thin strip between the door and frame to retract a spring latch, leaving characteristic marks on the plug face or latch.

Question 3

The Medeco biaxial cylinder differs from standard pin tumbler locks primarily because its driver pins:

Accepted Answer

Must rotate as well as elevate to the shear line

Answer

Medeco biaxial cylinders require each key cut to both lift pins to the shear line AND rotate them to the correct angle, activating the sidebar.

Question 4

In forensic analysis, 'false shear line' evidence most directly indicates which picking method was used?

Accepted Answer

Raking

Answer

Raking moves multiple pins simultaneously and often leaves evidence of false sets at the false shear line created by security pins.

Question 5

A Schlage B-series deadbolt uses a keyway designation stamped on the face of the plug. What forensic value does this marking provide?

Accepted Answer

It identifies the specific keyway to narrow key blank selection and ownership tracing

Answer

The keyway designation identifies which key blank series fits the lock, aiding in tracing key blanks and reconstructing access history.

(CFL) Certified Forensic Locksmith Practice Test

(CFL) Certified Forensic Locksmith Practice Test

CFL Lock Identification & Key Systems 2