Q1a - I'm sorry, was that a question?
Q1b - The same qualification I applied for the XXX other passengers.
Q1c - No.
Johnny, if you call the police they will come, but it is the authority of the PIC (or airport duty manager) to offload a pax... not the cops. Alternatively they might be called for an alleged theft or an assault not witnessed by anyone, in which case it gets sorted out after disembarking. In any case, the response needs to be proportional to the threat.