A woman asked Rav Shmuel Eliyahu, the Chief Rabbi of Tzfat, on a radio show, what she is allowed to do, as there is a drug dealer taking advantage of her son and selling him drugs son and the police don't do anything about it.

Rav Elyahu responded that as a mother she must do everything she possibly can, legal or illegal, to get the drug dealer away from her son. If a person sees that the authorities are not acting, it is allowed to take the law into one's own hands, when that person sees the attempts to cause someone to become addicted to drugs.

Rav Eliyahu described his efforts in Tzfat when dealing with drug addicts and how he saw the horrible affect drugs have on people and conclusively states that letting someone become addicted to drugs is like killing them.

First, in this situation, the mother should persist in trying to get the prime minister, defense minister, minister of internal security, the chief of police and any else possible involved to do what they are supposed to be doing.

After that, if it is still a problem, she should chase away these drug dealers with sticks and metal bars and do whatever she can do to hit them and persuade them to stay away from her son, whether using legal or illegal means.

(source: Srugim)