No. And initially, the checked luggage screening was set up in public areas in many airports, just as had happened in airports around the world, such as SIN, for decades before. You could still watch the process, provide keys if necessary, and be sure your bags were re-locked before departure. The TSA gradually moved all the screening out of public spaces, making it less efficient and impossible to monitor, plus subjecting passengers to huge risks when travelling internationally (esp. to countries with poor security on incoming baggage).