A woman is investigated for smuggling a baby. Officers find packets filled with cocaine, meth, and heroin in carrots — indicating gang involvement. Two young women are caught smuggling pills, and a wanted man triggers an alert.

Officers discover firearms that may be intended for a Mexican drug lord; a load of Fentanyl hidden in an ice cream freezer; a truck driver transporting puppies is under scrutiny; a wanted woman is detained in Brownsville.

In their battle against the cartels, Customs and Border Protection flag a tractor-trailer transporting tanks of liquid methamphetamine; officers nab an exotic reptile smuggler; 36 pounds of cocaine are found inside a pickup truck.

Officers question a man traveling with two children that aren't his; a traveler is caught smuggling cash; drugs are found concealed in a flatbed truck; a drunken man is restrained in Progreso, Mexico.

Officers in Laredo, Texas, help a troubled 14-year-old; drugs sent through the mail are seized; a nurse in Progreso, Mexico, is caught smuggling fentanyl; a woman with children is stopped; a drunken woman bares all to officers.

Multiple drug busts and arrests get made at various border crossings in Texas, including the discovery of the largest meth haul yet attempted at the Pharr-Reynosa International Bridge.

At the Brownsville, Texas, point of entry, officers encounter drug trafficking, fraudulent documents and illegal merchandise; authorities seize $7 million worth of marijuana hidden inside a rolled carpet during a routine cargo inspection.

Meth is found inside the walls of a trailer; brothers are caught smuggling prescription medication; illicit Mexican delicacies are confiscated at the border.

Upon detaining a woman smuggling Tramadol and Xanax pills, officers discover she is part of a larger drug ring; officers arrest a daily crosser after finding cocaine in her vehicle; an officer's hunch leads to the discovery of 500 kilos of marijuana.

Officers discover methamphetamine hidden inside a truck's speakers and confiscate drugs packed deep within lead boxes; a woman denies trafficking pain pills; a man is interviewed to confirm his citizenship.

A man returning from Mexico requires emergency Narcan after a suspected opioid overdose; an unlikely family is caught trying to smuggle firearms into Mexico; a woman attempting to sneak prescription meds into the U.S. is caught red-handed.

A man who arrives at the border with a baby is concealing another valuable commodity; a couple who fails to declare Mexican avocados ends up causing a scene; a teenager claiming to be a U.S. citizen arrives looking to attend high school in Texas.

Following the work of America's Customs and Border Protection agency, whose job is to defend the border and stop terrorists, drugs and illegal weapons from entering the country.

The cartel tries to sneak one last shipment over the border just before midnight; officers uncover a delivery that isn't what it seems; a woman acting erratically is found with a Santa Muerte statue, indicating she may have cartel connections.

Methamphetamine is found hidden within a semi-truck full of frozen broccoli, a man is caught smuggling pills inside containers of protein powder, a traveler tries to bring a deer trophy across the border, and an intoxicated US citizen is detained.

A woman returning from a shopping trip in the US attempts to smuggle dirty money into Mexico; a van full of clothes is hiding an exotic shipment; a man finds a clever hiding place for prescription drugs; a family tries to bring in illicit fruits.

A drunk driver causes a three-car crash; a man attempts to import counterfeit goods; an investigation is launched into a pill-smuggling ring, and a shipment of cocaine is found inside office furniture; an armed robber on the run is captured.

Dirty cartel money is found hidden in a truck; an intoxicated minor requires medical treatment; a man tries to enter the US with a false visa, and two sisters are caught smuggling meds; a large quantity of cocaine is found hidden inside trash bags.

Officers stop a man suspected of money laundering. Cocaine is found hidden in an unexpected area of a shipping truck. A traveler is caught trying to bring weaponry into Mexico. A father is stopped when trying to smuggle medication for his son.

An illicit shipment is disguised in bags of concrete. Officers identify a criminal wanted for burglary when he attempts to cross the border. A woman is caught smuggling too many diet pills. A retired police officer almost carries a gun into Mexico.

Officers find a surprise in a car that hasn't crossed the border before.

Agriculture specialists deal with cattle arriving without required seals.

An elite team prepares for the extradition of a cartel Sicario, or hit man wanted for murder in his home country; with the sale of guns and ammo strictly controlled in Mexico, cartels turn to America for the weapons to wage their wars.

K9s save the day, identifying gallons of paint and beer bottles filled with more than the officers bargained for; a man with a warrant for his arrest is concealing something suspicious; officers question the intentions of a chatty traveler.

An officer catches a woman trying to use a forged visa to get into the US; a rookie officer takes part in a major cocaine seizure; officers suspect a traveller claiming to be a pastor on the way to a religious conference may not be who he says he is.

Officers see a trend of narcotics being smuggled inside car dashboards.

A new officer makes one of the biggest drug busts her bridge has ever seen.

A couple from Mexico arrives with candy unfit for children's consumption.

A cartel hitman is extradited, and 50 gallons of moonshine is intercepted.

Cardboard packaging hides a secret; a laptop bag conceals narcotics.

A man's in a bind when trying to cross with an item that fell from the sky.

Officers catch a man trying to enter the US with a manslaughter warrant.

A million-dollar load is found within a shipment of mattresses.

A man who claims to have been kidnapped by a cartel seeks asylum in the US.

A covert load of hard narcotics is found in a tractor-trailer's air tank.

Officers discover an illicit load within a shipment of garbage bags.

A retiring officer makes a significant bust before hanging up his hat.

Officers uncover a lethal load. A woman and son are caught with fake visas.

A former teacher is surprised to find she has a warrant out for her arrest.

Two men attempt to smuggle a rooster for cockfighting.

A magician comes under scrutiny for traveling with his prop dove.

A concealed shipment is hidden in the fifth wheel of a tractor trailer.

An expectant mother tries to cross with an unexpected load.

A missing teenager with a rap sheet is turned in to the authorities.

Sisters are detained when one attacks an officer after binge drinking.

A cavity search reveals a smuggler concealing pills in an unpleasant place.

An X-ray flags a dark object in the fuel tank of a a band's tour bus.

Officers catch a car carrying more than gas in its fuel tank.

An inspection of travelers leads to the takedown of a cartel stash house.

A truck stolen by the cartel in Mexico comes back to America.

A truck with a compartment of drugs requires a complex code to open it.

Officers struggle to open up an engine part they suspect is hiding drugs.

Officers examine a trailer filled with cooking supplies and unearth a GPS tracker -- the kind cartels use to watch their loads. US citizens who accidentally approach the international border are inspected, and it turns out they have a few secrets.

When a drug dog alerts a vehicle full of clubbers heading to a techno bar, officers find the group has gotten creative with their illicit drugs; officers inspecting a couple's truck find bags full of rat carcasses to be used in a specialty soup. Content expanded.

When officers see an approaching vehicle make a sudden U-turn, they give chase and find a bag with a gun and ammunition. Tourists arrive with a large amount of Botox and dermal fillers, hinting they may be planning to perform cosmetic treatments for cash.

When two sisters are pulled over for making an unsafe lane change, officers discover they have an illicit stash that can't cross the border; a Mexican couple attempts to bring a bag of foul-smelling insects for a special recipe.

When a bus is stopped for a routine search, an X-ray reveals some contents may be under pressure; a U.S. family's pet parakeet is denied entry into Mexico and without special USDA approval, it may not be allowed back into America either.

When a trailer full of sea salt shows up at the bridge, officers decide to inspect it; the bags do contain a crystalline substance and it's an illicit one; during an inspection of a U.S. citizen, something illegal rolls out of his pocket

When a U.S. citizen returning from Mexico is flagged for having an arrest warrant, the man claims to have taken 20 morphine pills in order to avoid prison time; a shipment of car seat cushions coming into America is padded with more than foam.

A man entering the U.S. with more cash than the $10,000 limit raises eyebrows; officers find a cooler full of rat meat in the back of a traveler's vehicle, but further inspection uncovers something more surprising.

When a man waiting in the pedestrian line to enter the U.S. suddenly turns and sprints back toward Mexico, officers give chase; a Mexican national seeks asylum in the U.S. after claiming he was kidnapped and extorted for information by cartels

Travelers attempt to smuggle firearms within a load of sporting goods. Officers crack down on animal smugglers. Visitors like to bring home traditional gifts to their families in America, but there's still a limit to what can come across the border.

The border between the USA and Mexico is the busiest in the world. This series follows the work of America's Customs and Border Protection agency, whose job is to defend the border and stop terrorists, drugs and illegal weapons from entering the country.

Officers spot a lone pedestrian entering the U.S. with large bags; the search reveals containers of coffee, one concealing a package of suspected narcotics; the x-ray of a flatbed trailer reveals hidden bundles, but officers struggle to reach them.

A truck carrying household goods into Mexico is stopped for inspection; when several boxes are X-rayed, a gun and ammunition are found hidden inside a kids' toy box; a man re-entering the U.S. is stopped after checks reveal he is wanted for murder.

Officers are vigilant after a recent gun show in the United States; a traveler's car is inspected when he tells officers a suspicious story about his travels; a man is caught smuggling pills and must choose between jail or giving up information.

When an older couple crossing into the US has cartel logos on their packed clothes, they have some explaining to do. A Mexican driver says he's visiting a friend in Texas, but seems nervous. A vehicle search finds evidence of hidden compartments.

When a man is detained on a warrant, the mug shot confirms they have the correct man -- but his fingerprints aren't a match. A woman arrives at the border driving an oil worker's truck. Upon inspection, officers find white powder around the opening.

A woman claims she drove 13 hours for a 15-minute dentist appointment, but she can't remember the name of the dentist, and has no proof of her visit. Two men returning from a night in Mexico are pulled over after officers detect a strong smell of weed.

A man tries crossing with cosmetic injections stuffed into a sweet treat. A rookie officer follows a hunch after a Canadian narcotics smuggling trend.

When an American band is denied entry into Canada due to incorrect paperwork, CBP officers have to investigate. A U.S. citizen coming back from Mexico is flagged as having an arrest warrant -- while officers dig deeper, she attempts to escape.

A man traveling with his young daughter attempts a U-turn before the border and comes face-to-face with CBP officers. A stand-up comedian is stopped after declaring prescription meds, but further analysis shows that the pills test positive for fentanyl.

During the holidays, hundreds of thousands of people cross in and out of the US to spend time with their families, bringing with them gifts -- some naughty, some nice. But it's business as usual for the cartels; they blend in with the holiday traffic, making the season of goodwill no vacation for the officers of Customs and Border Protection.

As another year draws to a close, our thoughts turn to new beginnings and fresh starts. But at the border, some things never change -- certain old acquaintances aren't easily forgotten, and not all resolutions are destined to last. Here at America's front line, the one thing that's guaranteed this New Year is that the battle against smugglers never ends.

When a young bus driver approaches the border without any passengers in his coach, officers suspect a smuggling operation may be underway; a man attempts to drive into the U.S. with a van full of goods loaded with more than just clothing.

Officers find a man and his family driving a suspiciously modified truck. A young man is caught with narcotics strapped to his body. A crosser is detained for having a record of smuggling an illegal migrant across the border.