Police do not have a right to use a taser during the arrest of a person who refuses to get out of their car. When police use tasers, they are subjecting people to a cruel and unusual punishment that citizens are protected against in the Bill of Rights, making it not acceptable to use a taser.
It does not matter if they refuse to get out of the car or not, tasing someone is wrong. Having no ideal of the medical condition of the person that the police interact with, the electric current of the taser could very seriously endanger someone. Take a person with a history of seizures. That current of electricity could cause them to have a seizing episode. A person with a pacemaker could get the shock and it could stop the pacemaker. This would cause the person to be very much at risk for a heart attack. Then the police department would have a lawsuit. It is not worth the risk. Use physical force tactics instead. It IS what they are trained for.