I do not drink alcohol (personal choice) but I have already decided if I ever get pulled over and they want to perform a sobriety test, I would demand a blood test.
Anything less, could be faked by the officer.
A friend of mine was arrested for DUI in LA. He demanded a blood test and they drove him to the back of the police station and said the hospital was closed. Then they drove him around and booked him back into the same police station. The case was thrown out for violation of his civil rights.
We think they thought he didn’t understand the process because he’s of Japanese ancestry. They bet wrong. I can’t imagine what they do to people who truly don’t understand the process.