Be polite and cooperative, but do not volunteer additional information. If you are asked how much you have had to drink, you may decline to answer, but do so politely.
Do not refuse the chemical testing
If you refuse the chemical test you can still be convicted of DUI. You will also lose your drivers license for refusal. Take the blood, breath or urine test requested by the police officer. Note: the field breath test is only a field sobriety test, you still have to do a chemical test.
Call a lawyer right away
In Philadelphia, you will be held for arraignment. In other counties you will be sent a summons. Which ever occurs, it is imperative that you contact a lawyer as soon as possible to discuss your case and begin work on your defense.