Altering someone's writing without their permission. Pennsylvania Criminal Law Team outlines the state's forgery laws and penalties.For our help, contact us today. Forgery crimes are classified as both felonies and misdemeanors in Pennsylvania, depending on the type of document or instrument involved. Provide examples of your signature. Bring copies of enlarged checks etc. When completing the form, note the following: 1. You must have the full names and street addresses for all parties.