If they ask you “do you mind performing sobriety tests.” REFUSE.
If they tell you “I need to determine if you are safe to drive.” REFUSE
If they ask “can I just look at your eyes for a minute.” REFUSE
If they state “you don’t have any trouble walking, do you.” REFUSE
If they ask “do you mind if I look in your car.” REFUSE
If they ask you to do anything, REFUSE.
They will be nice and reasonable trying to get you to do or say something incriminating. DO NOT FALL FOR IT. They are paid to wear the badge. They are paid to be suspicious. They are not your friend right now. REFUSE.