President Clinton and Janet Reno pushed to have a few words in the law changed, claiming those words cured the Constitutional defect in the law.
The law has been challenged by criminal defendants several times since then. Five circuits currently have ruled the Clinton word change cures the Constitutional defect; three circuits have ruled the word change does not cure the Constitutional defect.
Gabe Metcalf is the first person, which I can find, who was charged only with the federal charge of possessing a firearm in Gun Free School Zone.
He has no criminal record or record of violence. He has/had a clear and present danger to defend against.
I have read some of what he has written. It is articulate and well argued.