The basis of a convincing persuasive essay is the quality of the suport you provide. For this essay, you will need to gather factual information: laws, statistics, dates, specific examples, etc. to demonstrate to your reader that your argument is valid.
Your task is to research this topic to gather information that will help you clarify your position --- and remember that you also need some information for the other side of the argument. That will help your reader see you as a writer who has examined all opinions.
The information from this website should also useful.