DAYTON - A Dayton High School freshman who was reportedly expelled last fall for carrying a pocket knife to school after allegedly making a threat to another student has been allowed to return to campus.

The school district itself is tight-lipped about the incident and about the student's return at the start of this semester, citing privacy laws. But the freshman's renewed presence on campus has created concerns and discomfort among some students and parents who say he should not have been allowed to return.

One family has decided to transfer their child to another district as a result of h...