This is why you sometimes see, for example, a device that is designed to accommodate RF shielding but the shield is not installed. It's cheaper to design the sh

This is why you sometimes see, for example, a device that is designed to accommodate RF shielding but the shield is not installed. It's cheaper to design the shield and then omit it in production if the tests happen to pass without it, than it is to risk failing a test and have to go back and redesign with better shielding.