Some states have laws that specifically address the issue of felonies and peace officers.
For example in California, any person convicted of a felony (or of a crime in another jurisdiction that would be a felony in California) is prohibited from employment as a California peace officer [
Cal. Govt. Code §1029(a)].
With few exceptions, this prohibition holds even if the conviction was sealed, expunged, or set aside. It may also apply to any convictions that were subsequently reduced to a
misdemeanor occurring on or after January 1, 2004.
Perhaps it would be better to see if the state in question has a similar law. The OP may wish to call that state's Peace Officer Standards and Training agency and inquire as to what state laws address this area.

