Hey bud. Just gonna give ya my 2 centavos here :D
I'm no cop yet, obviously. Others may have more concrete advice so take this with a grain of salt.
In Texas, there are a few agencies that hire up to 45 years old. Also a few that will subtract any military time from your age. So for you that would be 50 as your cut off age. They are few and far between, but they do exist. The DWAI 22 years ago will probably be a non-issue. You were 24 and you have a TON of great experience and a great track record since. I call that one water under the bridge, but do make sure you tell them about it up front and I'm sure they will see that your younger bad decision making days are long gone. One department that may be willing to hire at that age would be the Irving PD in Texas. You should check them out. They have three application dates coming up in March, April, and May. Good luck and if you ever wanna think about movin to Texas and need some department websites or info, just pm me
By three methods we may learn wisdom:
First, by reflection, which is noblest;
Second, by imitation, which is easiest;
and third by experience, which is the bitterest.
'Confucius'