* State law: Many states have laws dictating how long educational records must be kept. These laws often differ regarding the type of record (e.g., transcripts vs. disciplinary records).
* School district policy: Individual school districts may have their own policies that exceed state minimums.
* Type of record: Transcripts are usually kept indefinitely or for a very long time, often due to requests for college admissions, employment, and other purposes. Other records, such as disciplinary actions, might be kept for a shorter period, perhaps only until the student reaches a certain age or graduates.
In short, while some records (like transcripts) are likely to be kept for many decades, others might be purged after a few years. To find out the specific policies of a particular high school, you would need to contact the school's registrar or administration office directly.