Cheating death and fighting communism: that is how a fellow officer once described our job.  It was meant to be funny, but as time went on it seemed all too true.
I spent more than ten years in law enforcement, all of it on the street in uniform patrol.  I've been a patrol officer, instructor, sergeant and lieutenant. 
Do not report crimes here. Nothing here should be considered legal advice. All opinions are my own.
Both are full time jobs and it is not reasonable to do both. You can be an MD working for the FBI in a variety of capacities, though endercover work is not likely to be one of them.
I don't know why they are withholding information. It is very possible that it is an open investigation and exempt from open records laws.
                             Working the road. Where else?
Until you've had to make decisions on when to deploy a dog in a real-life, volatile use-of-force situation, and then justify those decisions to your chain of command, an internal affairs investigation, a city attorney and (probably) a court, how exactly do you figure you will have the credibility to tell others what they need to know?
It's one thing to know the law from reading a book or attending a training class, its another to apply it appropriately in the field. It is a bit like training in the dojo vs. a street fight. Or perhaps a better analogy is the guy sitting on the couch watching a football game who has never stepped onto the field, yet thinks he knows better than the players. 
Reality is a harsh, unforgiving mistress. Until you've danced with her a while, you simply don't know what you don't know. 
                          
                             Yes.
At the very least it would appear that he is trespassing.  But, do you know that he doesn't have something worse planned?  Rape, robbery, murder?
Door to door salesmen are certainly capable of committing very bad crimes.  Additionally, criminals can pose as door to door salesmen with the intent of getting in your house to rape/rob/murder you.
A stranger in your home that is refusing to leave is a serious concern and possibly a very real threat.  Make sure you communicate to the dispatchers that the man is a stranger - not a friend or family member - and he is refusing to leave.  If you have any level of fear, make sure you communicate that as well. 
                          
Radio program/music director
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                              Will the foreign state extradite? If so, feel free to call the local authorities. If not, the local cops will not be able to arrest him for the warrant.
Run for the office during the next general election. Becoming a deputy is a little easier, and you should contact the local department and inquire about employment if you would like to give that a go.
Yes, call the department he/she works for to confirm his/her identity. It could be a scam.
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