The preventive measures for drug addiction are:
- attractive advertisements should be banned
- avoid bad circle and peer group
- rehabilitation centres must be established
Kinda like a chaser with whiskey
Hopefully this should help you
http://gcc.glendale.edu/fire/Documents/ClassMaterials/Ropes/Ropes-VFA08.pdf
Knots start on page 35
plz thank me, it motivates me to answer more of your questions :)