Registration for the 45th Basic Training Academy (BTA) MSO Correction Officer Entrance Exam

The Middlesex Sheriff's Office (MSO) is seeking candidates interested in becoming correction officers at the Middlesex Jail & House of Correction located in Billerica, Massachusetts. The MSO is offering a correction officer entrance exam to those candidates who meet the qualifications set forth below. The Middlesex Sheriff's Office does not charge for this exam.


All applicants must complete the online Correction Officer Entrance Exam registration form above. You must complete and submit the online exam form by Saturday, October 30, 2021 at 5:00 PM in order to sit for the exam and be considered for this position. Those interested candidates that do not register online by the October 30, 2021 deadline will not be allowed to take this exam. Those candidates who pass the Correction Officer Entrance Exam should be prepared to take the Physical Fitness portion of the hiring process on Saturday, November 13, 2021.

All tests for the 45th Basic Training Academy (BTA) MSO Correction Officer Exam will be held at the: 

Middlesex Sheriff’s Training Academy
40 Brick Kiln Road
Chelmsford, MA 01824


EXAMINATION DATES:       Tuesday, October 19, 2021 at 5:00 PM                                               

Thursday, October 21, 2021 at 5:00 PM

Saturday, October 23, 2021 at 9:00 AM

Saturday, October 23, 2021 at 1:00 PM

Tuesday, October 26, 2021 at 5:00 PM

Thursday, October 28, 2021 at 5:00 PM

Saturday, October 30, 2021 at 9:00 AM

Saturday, October 30, 2021 at 1:00 PM

Tuesday, November 2, 2021 at 5:00 PM

Thursday, November 4, 2021 at 5:00 PM

Saturday, November 6, 2021 at 9:00 AM

Saturday, November 6, 2021 at 1:00 PM

LAST DATE TO APPLY:        Saturday, October 30, 2021 at 5:00 PM



  • Must be at least 21 years of age at the time of the examination;
  • Must have graduated from a high school or possess a high school equivalency test certificate;


  • Current/valid motor vehicle operator’s license;
  • Required to pass a physical fitness standards test (requirements can be found in the attachments below) and participate in an interview process, criminal background check, and a psychological and medical examination;
  • Those candidates who pass the Correction Officer Entrance Exam should be prepared to take the Physical Fitness portion of the hiring process on Saturday, November 13, 2021;
  • Required to attend and complete a twelve-week MSO basic training academy which includes written exams, physical fitness tests and firearm qualifications;
  • Bachelor’s degree preferred.  Prior law enforcement/security experience preferred;
  • In compliance with federal law, all persons hired will be required to verify identity and eligibility to work in the United States and to complete the required employment eligibility verification form upon hire.

NO MAKE-UP EXAMINATION:  No make-up examination will be offered due to personal or professional conflicts on the testing date/time.  Current military personnel who have active military orders that indicate their unavailability to take the entrance exam due to military service will be allowed to take a make-up examination.  Military personnel must submit a written request with their official military orders to the address or fax number noted below by Monday, October 25, 2021 at 5:00 PM.

TESTING ACCOMMODATIONS FOR PEOPLE WITH DISABILITIES:  If you need special testing accommodations due to a documented impairment such as a hearing, learning, physical, mental or visual disability, please submit a letter detailing your request.  Please include updated contact information with your submission.  You must also submit a letter of support from a qualified medical professional detailing what type of accommodation you require at the exam site.  This information is requested only to provide reasonable accommodation for the exam, and will not be used for any other purpose.  The documentation required above must be received seven days prior to your scheduled exam date, to the address or fax number noted below.

Middlesex Sheriff’s Office
Human Resources Director
400 Mystic Avenue
Medford, MA 02155
Fax: 781-960-2912
Phone: 781-960-2800

SALARY:  Starting annual salary from $58,800 to $61,022 depending on shift assignment after graduation from the 12-week basic training academy, plus additional monetary benefits covered under the collective bargaining agreement.

DUTIES:  Working in a correctional setting.  Under direct supervision of Senior Correction Officer or other employees of higher grade.  Maintains custodial care and control of inmates/detainees by escorting or transporting them under restraint; patrolling facilities; making periodic rounds, head counts and security checks of buildings, grounds and inmate quarters.  Observes conduct and behavior of inmates/detainees, noting significant behavioral patterns, to prevent disturbances, violence, escapes or other crises such as suicides; notes and investigates suspicious inmate/detainee behavior, including the possibility of contraband, by searching individuals, vehicles, mail, packages, and inmate/detainee quarters.  Guarding and directing inmates during work assignments to maintain order and security in a correctional institution.  Develops working relationships with inmates/detainees by referring individuals to appropriate supportive services (e.g., medical, psychiatric, vocational, etc.) as needed to aid in rehabilitation and foster an atmosphere of cooperation between inmates/detainees and staff; prepares reports relative to fires, disturbances, accidents, security breaches, etc, prepares evaluation reports on inmates/detainees. Accounts for inmate whereabouts at all times, makes entries into unit log of daily activities and reviews daily activity reports.  Maintain cleanliness and safety of work area; enforces regulations pertaining to meals, recreation, shakedowns, showers, visits, key control, and inmate movement.  Performs related operational duties such as screening visitors, operating two-way radios, carrying and operating firearms, serving food to inmates; will be required to work mandatory overtime in excess of 8 hours based on operational needs; must have the flexibility to work on multiple shifts as required to meet operational needs; and performs other related work as required. 

WORKING CONDITIONS:  Correction Officers work in a correctional facility on a 24/7 basis; work on varied shifts (7/3; 3/11; 11/7), weekends, nights, holidays and are subject to being forced to work over 8 hours depending on operational needs.  May encounter verbal and physical abuse from offenders; may be required to interact with people who are under physical and/or emotional stress; stand and walk for prolonged periods of time; may be required to work alone in an isolated area; may be required to lift and carry heavy objects; may be required to restrain inmates/detainees in accordance with policy.  May work under exposure to adverse weather conditions.