Creation of CIF rules and regulations, developed and approved by member schools, which all schools pledge to observe, began in 1914. This decision established an enforcement program designed to be a cooperative undertaking involving schools, leagues, sections and the State CIF working together for an improved administration of education based interscholastic athletics.
| DATE | SCHOOL | PROGRAM | VIOLATION | PENALTY |
| 2017-18 school year | Orestimba | Varsity Boys Soccer | 207.1, 207.3 | Forfeit all varsity boys soccer contests in which ineligible player participated (contests have not yet been reported). |
| 2017-18 school year | Placer | JV Baseball | 207.1, 207.3 | Forfeit all JV baseball games in which ineligible player participated (3/26-4/28). |
| 2017-18 school year | Stone Ridge Christian | JV Boys Basketball | 207.1, 207.3 | No action; all contests in which ineligible player participated were losses. |
| 2017-18 school year | Yuba City | Varsity Cross Country and Track and Field | 503.B.1 | Forfeit the following varsity events. Cross Country: Las Plumas Invitational (9/8/17). Track and Field: Steve March Relays at Del Oro HS (3/2/18). Submit a correction action plan, due 9/24/18. |
| 6/14/18 | Sonora | Girls Golf | 504.8 | Illegal practice. Preseason dead period extended by two days. |
| 7/24/18 | Bret Harte | Football | 2003.5, 2007.4 | Practice with helmets ONLY through July 26, 2018. |
| 8/10/18, 8/17/18 | Lathrop | Varsity Football | 2000 | No action; contest in which age-inappropriate player participated was a loss. |
| 8/17/18 | Pacheco | JV Football | 205.B.1.d | Forfeit JV football game vs. El Capitan HS. |
| 8/21/18 | Delta Charter | JV Girls Volleyball | 207.1, 207.3 | No action; contest in which ineligible player participated was a loss. |
| 8/23/18 | Lincoln-S | Varsity Girls Volleyball | 207.1, 207.3 | Forfeit varsity girls volleyball match to Ripon (8/23) for using ineligible player. |
| 8/24/18 | Rodriguez | Varsity Football | 205.B.1.d, 207.1, 207.3 | Forfeit JV football game to Piedmont HS due to participation by ineligible player. |
| 8/24/18 | Rodriguez | Varsity Football | 500.C | Warning |
| 8/31/18 | Golden Valley | Varsity Football | 205.B.1.d | No action; contest in which ineligible player participated was a loss. |
| 8/31/18 | Weston Ranch | Varsity Football | 205.B.1.d | Forfeit varsity football game to Franklin-S HS due to participation by an ineligible player. |
| 2016-17 school year | Gustine | Varsity boys soccer | 207.1, 207.3 | Warning. Violation was past statute of limitation. |