U.S. Customs and Border Protection agents in Arizona seized a record breaking 254 pounds of fentanyl on Saturday. The agency made the announcement Thursday, in what is now the largest fentanyl seizure in US history.

The dangerous fentanyl packages were displayed on a large table during the press conference. Federal law enforcement officials say that this amount of fentanyl is enough to kill tens of millions of Americans.

The truck driver attempted to smuggle the drugs by using a false floor in the vehicle, said CBP officers. The driver is now in federal custody and no other arrests have been made, officials said. An investigation is ongoing.

However, the issue comes at a critical time when the administration is fighting for tighter border security. Border Patrol agents

CBP officials said Thursday that they have been seeing less marijuana and more narcotics and opioids coming across the border.

It only takes the equivalent of four grains of salt of fentanyl to kill the average adult. Fentanyl contributes to the high rates of accidental opioid overdoses in the United States. Each day 130 Americans die from accidental opioid overdoses, which now kills more Americans than car crashes.

Prior to this seizure, the largest seizure of fentanyl was Nebraska in May, 2018. At the time, state troopers seized 118 pounds of fentanyl, which contained enough lethal doses to kill 28 million people.

Watch the documentary below if you want to learn more about the opioid crisis and the ongoing battle and challenges of the porous U.S. border with Mexico.