The U.S. Border Patrol says it's seeing more and more hard drugs being smuggled from Mexico. 

With marijuana legalization pushing demand down in some U.S. states, cartels are now turning to methamphetamine and heroin for profits. 

Meth seizures are up 300% in the last five years at California border crossings, while heroin seizures have spiked by more than 200% across the entire southern border. 

"The threat changes consistently for us. Marijuana has decreased for us here and what we see is more hard narcotics being hidden in smaller, deeper concealments in vehicles," said Pete Flores, CBP's San Diego field director.

Flores said they're seizing high-quality meth and heroin that is highly addicting.

Senior Fox News correspondent Adam Housley reported this morning from near the San Ysidro border crossing in California.

Watch the segment above.