The drug paraphanalia charge may or may not be a problem based on the Dept in your state's standards, and a DUI can be overlooked since it was 8 years ago if your records are flawless since then. The refusing a breathalizer and believe it or not your age are gonna hurt you the most. I know for example in New York State if you are over 35 and have not served as a police officer or in the military in the past...you need not apply. I feel like NY is rather strict, you may want to find the phone # of arizona state police recruitment and find out if they have any age regulations before you waste your time, because I am in the process of interviewing now and I have already spent 4 months on the first part of the process and if i get in it will be another 5 months before the academy starts. I don't know how much my answer will help you, but I hope that if this is what you want then you will take this advice and talk to someone in recruitment in the state you wish to apply in, thats the only way to find out if you have a shot. They'll prob tell you to apply so be prepared cause its a long process. Good Luck.