Horrible. you should see this article:
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There are several ways for OK to take your blood without your consent. If you were unconscious or incapable of giving consent, then the consent is implied and they will take it but you can later withdraw the inmplied consent. The other way is if there has been an accident with serious bodily injury or death to another person, then they do not need your consent. Also, if they obtained a warrant, they can take your blood without your consent. It is quite possible that you may have DUI charges coming down the road, ( or worse if there was serious injuries) and thus, I would highly suggest you contact a lawyer to discuss his matter in further detail so steps could be taken to protect you down the road if required.
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