Levi's Stadium on the day of a 2015 pre-season game between the San Francisco 49ers and Dallas Cowboys. Original public… https://www.rawpixel.com/image/3338346/free-photo-image-football-building-49ersFree Image from public domain licensePersonnel with U.S. Customs and Border Protection conduct operations in advance of Super Bowl 50 in Santa Clara, Calif.… https://www.rawpixel.com/image/8739229/photo-image-border-public-domain-blackFree Image from public domain licenseU.S. Customs and Border Protection officer Alan Syto gestures to a truck driver making a delivery to Levi's Stadium as a… https://www.rawpixel.com/image/8739231/photo-image-border-public-domain-personFree Image from public domain licenseU.S. Customs and Border Protection officer Alan Syto prepares a line of trucks for non-intrusive inspections x-rays outside… https://www.rawpixel.com/image/8739124/photo-image-border-public-domain-personFree Image from public domain licenseA U.S. Customs and Border Protection Black Hawk helicopter flies over Levi's Stadium, the site of Super Bowl 50, in Santa… https://www.rawpixel.com/image/8739294/photo-image-border-public-domain-blackFree Image from public domain licenseTrucks line up on a parking lot to be x-rayed by a U.S. Customs and Border Protection non-intrusive inspection vehicle, top… https://www.rawpixel.com/image/8739157/photo-image-public-domain-santaFree Image from public domain licenseA U.S. Customs and Border Protection Black Hawk helicopter flies over Levi's Stadium, the site of Super Bowl 50, in Santa… https://www.rawpixel.com/image/8739271/photo-image-public-domain-nature-landscapeFree Image from public domain license