If the officer believes it is "justifiable cause" yes, he can.
NO. He can search your car if he has just cause without a warrant.
Only where probably cause exists.
Any police officer can run your license number for wants or registration. No probable cause is required.
Under no circumstances can a police officer stop you or search you without probable cause. Probable cause is one of the ways that an ordinary citizen's right to privacy is protected from unlawful search and seizure.
No, police work for only the state where they are registered as a police officer. That would be the Attorney General's job as the State/Chief Prosecutor.
Assuming "Chock" is Choke. Yes it is illegal for a police officer to choke anyone without cause. However if the officer believes a suspect has drugs in his or her mouth and is attempting to swallow them. The officer may choke the individual to prevent them from swallowing said drugs.
due process
No more so than they can with a license they MUST have probable cause .
No more so than they can with a license they MUST have probable cause .
Police officers aren't required to have probable cause or any level of suspicion to check the registration status of a license plate or determine if it is stolen. However, police data systems cannot be used for personal business. The officer must have a legitimate law enforcement purpose in making any inquiry to the database. If the officer performed such an inquiry while off duty, it wouldn't necessarily be unlawful. He would have to have a legitimate law enforcement interest to do so, as opposed to some personal reason for making the inquiry.
the person driving the car would get the ticket so it wouldn't be your friend if you were the one behind the wheel. That is why the police officer asks the driver for their license. The driver's license # is how the Dept of Motor Vehicles finds out who actually got the ticket. Remember, the driver caused the violation, not the car.