2 Answers
The main thing to remember about a thesis statement is that it should be argumentative. The best papers have a clear, strong thesis that argues something. Since it’s about mandatory drug testing, you could have a thesis to argue something based on how you feel about it. This is an example that I could think of:
“Mandatory drug testing in schools is a strong deterrent against school violence and illegal drug possession on school grounds.” And you’d back up whatever argument you choose to make in you paper with supporting details, statistics, and case studies (I strongly recommend these).