I would say that it's absolutely necessary to do both together, and that the results can be seen.
Roadblocks are effective, but very often, the strategy needs to be complemented by publicity. That's why I think more time—9 to 12 months—is needed for implementation. People have to be made aware. There needs to be publicity, and the people need to be informed.
We also need to devote the appropriate resources. If the law allows it, but the millions of tests requested in order for it to be effective are not done, the whole thing will probably not be effective. For me, education campaigns and funding for additional tests are a major concern.