If you are arrested for riding under the influence of alcohol or drugs and you refuse a chemical test, your license:

Pennsylvania's Implied Consent law states that by being licensed to operate a motor vehicle in the state, a person has given their consent to undergo a chemical test if requested by a police officer. If a person refuses such a test, their license will be suspended for one year, even if they are found not guilty of riding under the influence.
DMV Writen Test