I'm in Law Enforcement as well, looking into the same field...
Just look up NRC's Fitness for Duty requirements, still be able to pass background and gain clearance, pass company training for whatever level you can qualify for. (ie. Tactical Reaction team (I imagine similar to Swat team) or fixed post guard).
Other than that, looks like you just have to wait til a job opening comes up, or speak with the company's recruiter which seems harder than it looks. Still haven't gotten a reply from a recruiter on the east coast. Though I would like to stay West Coast/Mid West for family.