The case itself wouldn't be dismissed, but the results of the blood draw could be suppressed if they were illegally obtained.
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He needs to get a lawyer and fight the charges if he wants to even hope for a dismissal.
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Just because one thing is bad in the investigation doesn't mean that the entire case is dismissed HOWEVER if that piece isn't used in a case it could cause the States case to crumble. Get an attorney to fight this for you.
Yes the evidence (blood test) can possibly be thrown out if the argument is made properly. You should hire an experienced DWI/DUI attorney. If you want to find one here on AVVO you can select "Find a Lawyer" at the top of the page. Good luck.
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