During the early days the cheapest and easiest way to execute a person is by cutting his/her head off with a sword and sometimes by stoning. Later on another alternative was discovered which is hanging by rope. When gun was invented another way of execution was discovered which is by firing squad. Then there was electricity and death by electrocution was tried. Now we have the deadly chemicals which can put a man to sleep forever (which I think is a more humane way of executing a person). Maybe Saudi Arabia is not yet aware of the evolution of execution and needs to be reminded of it. They can well afford the chemicals with their petro dollars.