I really think it depends on what state you are in and what the job market is like in the area you want to work. In the past, when it was more competitive to get into EMS, a DUI was a real career killer in many if not most places. However, at the present time, when most agencies are in need of people, it very well may not be. Assuming it was a strait misdemeanor DUI with no accidents or enhanced charges, the good news is the amount of time between your DUI and now. Most companies want to see a significant amount of time between issues such as that and when you apply. Where I work in California, I personally know several people that did get hired with a DUI, but it was right at or past the 7 year mark. It may very well be different in other states. I would do what other posters have said and call the companies you want to work for. If it is a hard no from all of them you have two options. Either you can choose a different career path, or you can complete your course and get your National Registry and look to relocate somewhere where the job market is more favorable to you. If EMS is what you are passionate about, you may have to make some sacrifices to make it happen. Good luck with whatever you choose!