That's the point of the article, Debeque, it would be unlawful to even draw the blood. It isn't whether or not you decide to hand it over. Reading Comprehension 101.

The truck driver was not at fault and under no obligation to prove his innocence. He was the victim in the crash.

This cop obviously overreached his jurisdiction and based on his statement - "I’ve never gone this far" - it sounds like he has violated more than one person's constitutional rights.