yeah, I think the key bit is "Villanueva said a search warrant could only have been obtained for Woods’s blood samples if the golfer had appeared to be in a state of impairment."
If that's the law in the US, then the law is an ass, particularly with his track record.
Here, there are occasions other than where there is suspicion of impairment where a drink/drive procedure can be legally pursued. Just one example is where a moving traffic offence has been committed - that gives the police the power to require a breath test regardless of any suspicion of impairment. But, equally, there are occasions where there needs to be suspicion that a driver is impaired.
I understand your surprise that it hasn’t happened in this case but we are talking about the U.S where, in some states, it may well be a capital offence to wear a loud shirt in a built up area.