Employment Opportunity

Firearms and Tool Mark Examiner

Baltimore County Police Department, Towson, Maryland

Salary: $75.00 Hourly

Final Filing Date: Open until filled

Regular Schedule: 20 hours per week. Non-Merit vacancies exist in the Police Department, Forensics Services Section. Non-Merit positions are not classified within the Baltimore County Government Classification and Compensation Plan.

Under general supervision, conducts forensic examinations and analysis of firearms, ammunition, and related physical evidence pertaining to law enforcement investigations. Serves as a court qualified expert witness in the field of firearms and tool mark examination.

Duties and Requirements Click to read more


  • Examines, identifies, and analyzes firearms and related physical evidence including bullets, cartridge cases, shot shells, wadding, and live ammunition.
  • Identifies fired bullets, cartridge cases and other ammunition components as having been fired from a specific firearm.
  • Test fires firearms and recovers representative samples.
  • Enters test fire and evidence images into regional and local databases.
  • Accesses databases to search for and retrieve information.
  • Examines fired bullets, cartridges and cartridge cases.
  • Identifies any unique markings present on these such as striations, scratches, breech marks, firing pin impressions, extractor marks, and ejector marks.
  • Identifies the caliber and manufacturer of ammunition and components.
  • Obtains standards from firearms in question.
  • Uses a comparison microscope to compare standards with evidentiary materials.
  • Determines if the standards and evidentiary materials came from the same firearm.
  • Compares firearms and fired ammunition.
  • Examines firearms, identifying and documenting their condition, defects, and characteristics.
  • Determines if altered weapons are in violation of Federal Law.
  • Restores serial numbers on weapons.
  • Utilizes a national database (NIBIN) to associate firearms and/or fired cartridge case evidence to other criminal incidents by conducting digital microscopic comparison examinations.
  • Physically and chemically examines evidence.
  • Tests garments for gunshot residues and patterns.
  • Identifies bullet entrance and exit holes in clothing and other materials.
  • Determines the distance and angle traveled of fired bullets.
  • Examines tools and suspected tool marks. Makes test markings and performs microscopic comparison examinations on tool marks to determine if a specific tool was used in an incident.
  • Formulates and presents conclusions based on test results.
  • Prepares detailed, technical reports.
  • Prepares and maintains records and case files.
  • Preserves and labels evidence.
  • Collects and transports evidence from field sites.
  • Performs other related duties as required.


  • Graduation from an accredited college or university with a bachelor's degree
  • plus
  • at least two years' experience in the forensic examination and analysis of firearms, ammunition, and related physical evidence.
  • Experience in the field of firearms, the processing or examination of forensic evidence, or the laboratory testing of materials, may be substituted on a year-for-year basis up to a maximum of four years for the required education.
  • Must have successfully completed training in the field of Firearms and Tool Mark Identification and acquired authorization to conduct independent comparison examinations in an accredited forensic laboratory.
Knowledge, Skills, and Abilities
  • Knowledge of the principles and practices of firearms and tool mark examination. Knowledge of firearms and ammunition. Knowledge of the principles and practices of forensic science. Knowledge of forensic laboratory operations. Knowledge of the principles and practices of law enforcement.
  • Skill in examining, identifying, and analyzing firearms, ammunition, their components and related materials. Skill in handling, loading, and firing firearms. Skill in identifying fired bullets, cartridges cases, and other ammunition components as having been fired from a specific weapon. Skill in collecting, processing, labeling, and storing evidence. Skill in preparing and presenting reports. Skill in maintaining records.
Proof of Licenses, Certifications and Education
  • Applicants are required to submit proof of licenses, certifications and education beyond high school to meet the required and preferred qualifications of the position. Diplomas or transcripts must show the applicant's major field of study. Copies and unofficial transcripts are acceptable.
  • Failure to submit proof of Licenses, Certifications and Education will result in your application not being considered. Proof of licenses, certifications, and/or education must be submitted with each application.
  • Proof of Degree Equivalency - Applicants who have obtained a degree from outside the United States of America are required to submit degree equivalence documentation from World Education Services, Inc. (www.WES.org)

Do you have the Education Required? See available on-line and campus-based degree programs now!

How to apply: Apply online

Posted: November 29, 2019

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