If you refuse a blood test in Pennsylvania and you are later charged with DUI, the DUI charges will be under Tier I, the lowest tier possible for an alcohol-related DUI. If there was also an accident involved in your case where someone was injured or there was some damage to property, the DUI charges will be under Tier II, the next highest tier possible for an alcohol-related DUI. If you are charged with DUI for being under the influence of a controlled substance or some other drug, the DUI charges will be under Tier III, the highest tier. The police can apply for a search warrant to get your blood to conduct testing. If you refuse a blood test after a search warrant is issued for your blood, the DUI charges will be under Tier III, the highest tier possible for an alcohol-related DUI. See our resource section for more information on the possible sentences for each of the Tiers. resources page