They could, but "I'm feeling kind of funny, it must be the weed" is easier to slide by compared to "I'm feeling kind of funny, I need to call Dad ASAP".

I guess they could have. At the time in the 90s, rohypnol wasn't so common. And now, girls are much more careful about watching their drinks than watching their weed. The fact that she was out at a party with older boys and smoking weed definitely made it impossible to tell her parents. But I guess the point of all of this is that these stupid educational videos about drugs would be more effective if they talked about real things that happen instead of trying to create false fears. The reality of being a teen surrounded by drugs and sex abuse is scary enough.