There are over 6,000 special agents of the U.S. Secret Service who protect the White House 24 hours a day, 7 days a week. The president is well-protected because the Secret Service has various security systems in place to secure the leader of the free world and other government officials.
These tools include food-scanners, radars on rooftops, strategically placed surveillance cameras, security checkpoints, metal detectors, listening devices, K9 dog units, and others. To become a special agent requires vigorous training. Thus, only the best make it and are trusted to protect the U.S. president. Check out this infographic to learn more about the Secret Service.
Credit: Q-See (used with permission)