If you are hoping to be a teacher in Pennsylvania, you have to be very particular about how you report a pending crime or a previous conviction. The Teacher Information Management System ("TIMS") online registration asks applicants if they have ever been convicted of a misdemeanor or felony (not summary offense). It also asks if a person has any pending criminal charges or subject to an inquiry or investigation by law enforcement anywhere. If you are currently on ARD, you do have "pending criminal charges" so you would have to report that on your registration.
If you are a current employee, all public school employees (i.e. public teachers) there is a a requirement that within 72 hours of an arrest for any crime listed in Section 111(e) or 111(f.1) of the School Code. If a teacher does not self-report when required to do so, the teacher can be subjected to professional and employment discipline. The potential courses of action that can be taken on the teacher depend on the type of crime charged and the type of victim (i.e. a child). Thus, for a teacher, it is critical to balance your obligations to the criminal court (and your lawyer) as well as your employment obligations.