What area of criminal justice are you interested in? If you were hiring someone, what would you look for as far as skills? How can you get those skills? Yes, questions, because in criminal justice, you need to be able to fend for yourself.
Answers: Don't overlook customer service types of jobs. You learn a lot about people in customer service. Some of the best profilers I have ever known are the skycaps at the airport. They could tell who the good tippers were before they even spoke to them! You will need to be good at talking to people and "reading" people - watching body language. Waiter? Delivery person for an auto parts store? Warehouse/landscaping business proves you can handles physical work. Life guard? ability to handle boring work (routine patrol can be boring at times), or, stay focused in the face of distractions (?)
You will need to learn to understand the concept of "transferable skills." Not everyone can see the relationship between the jobs you have had and the job you are applying for, so you may need to give a brief explanation on your resume. For example, I went from law enforcement to career counselor: I focused on my ability to talk to people, and get them to voluntarily talk to me, complete reports, and maintain confidential information.
I hope this helps - let me know if you have any questions!