Here in Alabama you have to pass the PE exam and complete 4 years of something similar to an understudy to be considered a full fledged engineer.
Which reminds me; one of the guys I work with passed his PE last year and he is in sales but he approaches everything from the engineering side of the project and gets his bellybutton handed to him because he is always trying to make something more complicated instead of just seeing the simple way of working on an issue.