Re: (Missouri) Sis Probation(Child Support) Becoming an Police Officer/Agent
A felony conviction will be an automatic bar to employment as a peace officer. You will have to look into any possibility of getting that conviction expunged with firearm rights restored before you might have any chance at employment as a peace officer.
Your education, while somewhat impressive, is only part of the equation. As Cyjeff mentioned, these jobs are competitive these days and that prior conviction will weigh heavily against you.
A Nor Cal Police Sergeant
"Make mine a double mocha ...
... and a croissant!"
Walk humbly with your God
-- Courageous, by Casting Crowns