Many possible issues can occur in this. Firstly, when the pharmacist is trying to mail a letter or medication to his or her apartment, it may be sent to another building because of wrong information. Secondly, the person who changed the address would have the possibility of going to jail. The court would consider this as violation to the law. Lastly, for any reason if the patient lost her way home or doesnt remember her address, it would be fustrating to see that her address was changed and that would make her go...... well crazy I guess. :)