Looking across at the Mexican side of the river, nighttime is when smugglers mostly try to cross.

A member of the Texas National Guard works with a Border Patrol Agent and one of the dogs inspecting cars entering the checkpoint.

While Congressman Murphy was at the checkpoint, a Border Patrol dog alerted to piece of marijuana leaf the size of a ladybug hidden in the console of a pickup truck.

The Border Patrol uses dogs at the checkpoints that are highly trained to detect drugs and hidden illegal immigrants.

The Border Patrol has a 15 man ATV unit that patrols the rough border terrain. Each member receives extensive training to ride and navigate the land.

Cows and other livestock can be seen grazing on the Mexican side of the Rio Grande River.

The Rio Grande River separates the U.S. and Mexico. Crossing the river to enter the U.S. illegally can prove to be dangerous and deadly in many areas.

The terrain along the border is extremely rough and covered by bamboo like plants that easily hide people trying to cross the border. The Border Patrol's ATV unit patrols the area riding through paths that are barely wider than the vehicle.

Congressmen Murphy and Barrett with the Acting Chief of the Border Patrol. The screens in the background show the border monitored by 43 cameras.

Congressman Murphy and Congressman Gresham Barrett (SC-3) visit with a Texas National Guard member monitoring cameras overseeing the border.

Trucks are unloaded on a dock where the cargo can be inspected.

If Customs Agents have any questions regarding cargo, the truck is unloaded. Agents search for drugs, illegal immigrants, and counterfeit products.

Laredo, Texas is the busies commercial land border port in the U.S. Every tractor trailer entering the U.S. is inspected.

700 pounds of drugs were hidden in this bus's secret compartment trying to be smuggled into the U.S.

U.S. Customs inspects more than 100 buses entering the country each day. Gamma rays are used to detect if there are any drugs or illegal immigrants hidden in any secret compartments.

Cars are lined up at the U.S. Customs checkpoint entering the country from Mexico.

.S. Customs seized 730 pounds of high grade cocaine being smuggled in on a bus entering the U.S. from Mexico. The street value of the cocaine was more than $20 million. The Border Patrol uses dogs, x-rays, and their own trained eyes to pick up narcotics.