It depends on what you mean by threaten. Very generally speaking, it isn't legal to use a weapon to threaten another person who does not have a weapon, but there are other types of threats that can be used under certain circumstances. For instance, it may be legal to threaten to arrest someone, or to threaten to handcuff the person. It just depends on the circumstances.
They can threaten you, however, to enact an arrest without probable cause or reasonable suspicion that you've have in fact committed a crime is considered false arrest. If an incident like this occurred, you may wish to file a complaint against the officer with his/her desk sergeant.
There is no such thing as an illegal argument so the illegal police will not arrest you.
"You are under arrest!" said the police officer.
It sounds like you're asking an opinion question. In my opinion, yes. If a person is caught with illegal drugs, yes, a police officer should arrest the person.
Yes, of course. An arrest warrant is a command from a judge to arrest a person. Usually a police officer has no choice and must arrest.
A person is "under arrest" when a police officer charges them with a crime and chooses to take them to the police station to be processed for it. For example, if someone commits a crime, they are technically under arrest when a police officer witnesses the crime or has a warrant for the arrest and tells the criminal "You are under arrest." Typical procedure after this is to put handcuffs on the criminal and read them their Miranda rights (you have the right to remain silent etc). Handcuffs alone do not mean arrest, but i'm pretty sure its illegal for a police officer to handcuff someone without grounds to arrest them. As a side note, the person doing the arrest does not have to be a sworn in police officer. In Citizen's arrest cases, anyone with arresting powers like a bounty hunter can also place someone under arrest.
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.
No, in most jurisdictions, citizens are not legally allowed to perform a citizen's arrest on a police officer.
No.
A police officer making an arrest
yes