Islam has protected humans from anything that can cause harm and spread of sins. Some of what Islam has provided is the law of Punishment that puts society in order and organize people's relations in order to make them live in harmony. On of the important rules that the Islamic law was built on,is that a person is not punished on behalf of another person's mistake. The Punishment comes along with how bad the criminal act was,so the robber wasn't punished by killing, nor the murderer jailed for tow days for example, and then no Punishment was build on suspicious doubts, unless solid evidence and eye witnesses are provided. Islam made the Punishment of harming society stronger. The drug dealers Punishment was not mentioned in the Quran or sunna. But because of the great damage caused to individuals and society, therefore the death sentence is justified under special circumstances and comes by the measurements of Islamic rules.