Education and fear. First day of school, send everyone to the gym for a frank discussion of the dangers of the possibility of street drugs being laced or coming into contact with Fetanyl. Give them facts and statistics (based on some I've seen here):
More people die from coming into contact with Fetanyl each year, than Americans killed in the entire Vietnam War.
In this student body, there is probably going to be one of you that dies from Fetanyl, maybe more depending on size of student body.
Your dealer may unknowingly give you a drug that is laced, or has come into contact with Fentanyl.
One pound of Fentanyl can kill over 450k people.
Show the penny picture.
List off the musicians, actors, rappers, and athletes that died from Fetanyl.
You really have to work on instilling in them that the risk is not worth the reward, that it can really happen to them, and hope that mindset carries over into college, or after high school. For college kids, same thing, but through campus organizations.
CHIEF