https://www.nfhs.org/articles/elimin...hool-football/
The elimination of clipping from high school football is the latest attempt to reduce the risk of injury made by the National Federation of State High School Associations (NFHS) Football Rules Committee.
The decision to eliminate clipping in the free-blocking zone (Rule 2-17-3) was the most significant of three rules changes recommended by the NFHS Football Rules Committee at its January 22-24 meeting in Indianapolis. All rules changes were subsequently approved by the NFHS Board of Directors