When your priorities include maintaining the security of the mail, you need to ensure that not just your employees, but also your contractors can be trusted. After all, the Postal Service engages thousands of contractors to help its workforce move the mail in various ways. One of which is handling mail at its Surface Transfer Centers (STC). The Postal Service operates 13 STCs across the country, seven of which are managed solely by suppliers who employed more than 1,000 contractor personnel as