Most non-competes arn't worth the paper they are written on.
The courts will not stop a person from earning a living in thier field of work. Non-competes really only apply if the ex employee uses confidential company information (customer lists, secret manufacturing processes, financial knowledge etc.)to steal customers or do other damaging things to the origional company. This type of thing usually applies only to people in upper management, research or similar positions. Also you need good lawers to make them stick