You may want to use statistics for your research, as a way to demonstrate the extent of the problem you're researching or how many people are impacted by it. While scholarly articles often include statistics, they generally only relate to the data collected for that particular research study, or they may be out of date by the time you read the article. For this reason, you'll often need to look beyond articles to find the most current statistics.
This page includes a few recommended resources for finding statistics, but there are many more statistical resources available online. You can use a search engine like Google to find the government agencies responsible for collecting the statistics that interest you, such as the United States Census Bureau (for finding census and demographic data). Contact your librarian if you need any help with this.
The Occupational Outlook Handbook (OOH) from the Bureau of Labor Statistics (BLS) is a searchable database featuring hundreds of career profiles. Searching for an occupation will provide a job description and other information, such as median pay and how to enter the occupation. Below are entries relevant to careers in Criminal Justice: