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Criminal Investigator Job Description: Top Duties and Qualifications

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A 4240227criminal justice9.41investigator7.8law enforcement6.48private investigator2.21criminal investigator2.07529217011115000.0067168.84155000.00YEARLY5242092025-10-012025-10-312025-09-012025-09-302025-11-05Criminal Investigator, or Detective, is responsible for working with other law enforcement professionals to solve various crimes. Their duties include analyzing evidence to make inferences about suspects and motives, interviewing witnesses and potential suspects and writing reports throughout the process to add to the case files.

4240227criminal justice9.41investigator7.8law enforcement6.48private investigator2.21criminal investigator2.07529217011115000.0067168.84155000.00YEARLY5242092025-10-012025-10-312025-09-012025-09-302025-11-05Criminal Investigator Duties and Responsibilities

An Investigator or Detective will usually perform the following duties:

  • Collect, analyze and preserve evidence.
  • Investigate complex criminal activities or local, federal or state law violations.
  • Direct crime-scene investigators or other law enforcement personnel at crimes scenes.
  • Gather evidence and make informed decisions and conclusions by employing deductive reasoning and analysis that leads to prosecution.
  • Write detailed reports, file and maintain all records while maintaining strict confidentiality.
  • Coordinate search and arrest warrants, arresting suspects as necessary.
  • Testify in court about findings and evidence.
  • Undergo continuous training as needed.

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Criminal Investigator Job Description Examples

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What Does a 4240227criminal justice9.41investigator7.8law enforcement6.48private investigator2.21criminal investigator2.07529217011115000.0067168.84155000.00YEARLY5242092025-10-012025-10-312025-09-012025-09-302025-11-05Criminal Investigator Do?

Investigators typically work for law enforcement agencies to help solve crimes and reduce illegal activity by apprehending suspects. They work closely with other Investigators or Detectives, Police Officers and Forensic Scientists to solve thefts, homicides, vandalism or assaults. Their job is to research criminal activity to find patterns with current crimes and obtain credible evidence that allows them to get arrest warrants for suspects. They may also be responsible for conducting surveillance in a particular area to track their suspect’s movements or monitor criminal activity.

4240227criminal justice9.41investigator7.8law enforcement6.48private investigator2.21criminal investigator2.07529217011115000.0067168.84155000.00YEARLY5242092025-10-012025-10-312025-09-012025-09-302025-11-05Criminal Investigator Skills and Qualifications

A good 4240227criminal justice9.41investigator7.8law enforcement6.48private investigator2.21criminal investigator2.07529217011115000.0067168.84155000.00YEARLY5242092025-10-012025-10-312025-09-012025-09-302025-11-05Criminal Investigator needs a variety of skills and qualifications that include the following:

  • Good communication and interview skills. Good interview skills are vital to any investigation. A 4240227criminal justice9.41investigator7.8law enforcement6.48private investigator2.21criminal investigator2.07529217011115000.0067168.84155000.00YEARLY5242092025-10-012025-10-312025-09-012025-09-302025-11-05Criminal Investigator must ask clear questions to find out as much detail from the interview as possible and recognize any gaps in a story. The Criminal Investigator must also be a good listener and have the ability to read demeanor.
  • Ability to use various forms of equipment or technology. Criminal Investigators often use technology to help in their investigations. The equipment varies according to the type of investigation.
  • Thorough knowledge of the law. A Criminal Investigator needs to know the laws surrounding a case. He or she must also know what they are legally allowed to do during the research, otherwise, the evidence may be thrown out of court.
  • Honesty and good ethics. An Investigator must be ethical, honest and law abiding. If a Investigator is caught lying or using unethical methods, he or she will lose credibility, perhaps lose their job or even be convicted of a crime themselves.
  • Critical thinking, deductive reasoning, social perceptiveness and problem-solving skills. Piecing things together requires good problem-solving skills, especially to find out the truth about what really happened. Critical thinking allows the Investigator to look past the obvious solutions and to objectively analyze evidence.

Criminal Investigator Salary Expectations

The average salary for a Criminal Investigator with 4 to 6 years of experience is $66,508 per year. This salary estimate is based on 383 salaries anonymously submitted to Indeed by Criminal Investigator employees, users and job posts over the past 36 months.

Criminal Investigator Salary Expectations

2025-10-0115000.0067168.84155000.00YEARLY
  • Common salary: 67168.84 YEARLY
  • Typical salaries range from 15000.00 - 155000.00 YEARLY
  • Find more information on Indeed Salaries

*Indeed data – 2025-10-01

Criminal Investigator Education and Training Requirements

Applicants for a Criminal Investigator position must have a degree in Criminal Justice or Police Science. Additionally, they need to have taken some courses in psychology, computers, English and advanced science. At a forensic crime lab, a Criminal Investigator candidate will need a major in biological sciences. Applicants for a federal-level job, usually have a master’s degree to improve their credentials.

Criminal Investigator Experience Requirements

A Criminal Investigator position calls for proven work experience. This experience may vary depending on the position offered. Experience may be varied in different investigator fields such as analyzing crime scenes or managing evidence. Make sure to include the experience requirements that are best suited to your field.

Job Description Samples for Similar Positions

Although this is a great Criminal Investigator job description sample, you may be looking for something else, such as:

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Frequently asked questions about Criminal Investigators

Three individuals are sitting at a table with a laptop, a disposable coffee cup, notebooks, and a phone visible. Two are facing each other, while the third’s back is to the camera. The setting appears to be a bright room with large windows.

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Job Description Examples

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