
Quoting
LawResearcherMissy
I am...stunned...at your thinking here. To be charitable about it. Do you honestly believe that you are just that incredible, that this man should put his entire career and livelihood on the line for you? What makes you so vitally important to the police department, that he should run the risk of ruining his rep and losing his job if he sticks his neck out for you and you bugger up the works?
No, kiddo, that's not how the Real World works, especially not in law enforcement.
Local jurisdiction's rules govern whether or not your record will disqualify you. You need to discuss your options with both your local police academy and your PD. Given that your conviction involved you threatening someone with a large knife (who DOES that??), you may be found to be temperamentally unfit and not to be trusted with a deadly weapon at all.