You must contact the personnel department of each agency for which you are applying. They will certainly do a background check and find the arrest and conviction. Each agency has it's own requirements and standards. I doubt however, that, if you are on court probation, you will be accepted.
Unfortunately, it is highly unlikely you would be accepted by any police agency while on probation. In fact, having a DUI conviction on your record will either close the door completely or make you wait a number of years before they'd even consider you.