I'm guessing you're stationed in the Republic of Korea currently, where a persistent rumour exists that the moment an officer drinks any amount of alcohol - even if only one beer - any order they give is null and void. This is simply untrue.
If the investegator is acting in his capacity as a police officer, then the repossession would be considered to be done under the color of law. It probably would not be a lawful repossession.
blod
Negative. Only if the officer has reasonable cause to believe that the driver is or could be under the influence of a behavior changing substance.
An unlawful order is one that is clearly outside the authority of the person giving it. Ordering someone to commit a crime is clearly unlawful. Killing a civilian (meaning an unarmed non-combatant, not simply someone who doesn't wear a uniform; an armed civilian is a combatant and thus a legal target) would be an example. Countermanding an order of a superior officer is one that occurs, but is not necessarily unlawful, it can get into sticky situations.
An arrest refers to the lawful deprivation of the freedom of an individual by a peace officer. A police officer may arrest a person if he reasonably believes a crime has been committed without a warrant.
Arrest
Here: All things are lawful unto me, but all things are not expedient: all things are lawful for me, but I will not be brought under the power of any. (1 Corinthians 6.12)
If you refuse you can risk your license being suspended or even jail time.
If you refuse you can risk your license being suspended or even jail time.
Not usually, unless the officer has some reason to believe that you are under the influence of, or have swallowed, something else besides alcohol
Unless you are under some kind of court order which "stays" any actions on your part, you are not prohibited from filing or doing anything that is lawful and proper.
Yes. With very few exceptions a police officer is never required to act.