You can refuse blood or breath tests, otherwise known as chemical testing, but it is not advisable because doing so carries penalties beyond those the DUI alone might bring.
If you refuse a blood or breath test, the police officers involved will notify the Pennsylvania Department of Transport. If you are a Pennsylvania resident, you will automatically lose your license for at least a year. If you are an out-of-state driver, you will no longer be permitted to drive in Pennsylvania.
The driver will receive a letter informing him or her of the license suspension or revocation of driving rights and be given 30 days to file an appeal to Pennsylvania’s Court of Common Pleas. If the appeal is filed correctly, the driver will receive a court date for a hearing to see whether the police officers were followed the correct procedures.