Can law enforcement take your blood for a sample to test without your knowledge?

Question Details: I had wreck and they life flighted me to the hospital. Well, 8 months later, they knocked on my door and told me that they had a warrant for me on for DUI. I told them that I have never had a ticket anything. However, I went to jail. I had my copy of bloodwork sent to me. There was no alcohol in my system or drugs, except for my prescription medicine. This is my first DUI.

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