Very good example of why you should always refuse roadside tests, including the preliminary breath test. In Utah you are NOT required to perform any of these tests and refusal cannot be used to establish probable cause for an arrest. These tests have one purpose, which is to gather evidence for probable cause. These tests are NEVER EVER used to establish your innocence or ability to drive safely. That is not what they are for at all, as you can see that this completely non-intoxicated person was arrested after showing no real sign of intoxication (balance, slurred speech, zeros on the breath test) yet was arrested based on probable cause because he didn't count the correct number of steps or perfectly follow the rules given to him by the officer.
You can comply with your required actions like giving ID, registration, proof of insurance. You always MUST exit the vehicle if told to do so by a police officer. Be polite and calmly explain that you don't want to answer questions unless accompanied by a lawyer. Just be polite and don't answer any invasive questions like "When's the last time you smoked weed?" or "How much have you had to drink tonight?" Don't lie! Just refuse to answer the question even if it is truthfully "I have never smoked weed and I have never had alcohol in my life." Just don't answer the question.
Had this kid kept his mouth shut and not done the tests he would not have been arrested because there would have been no probable cause for an arrest.