CBP officers working at the Pharr International Bridge cargo facility on Nov. 19 encountered the truck driver with a shipment of fresh produce arriving from Mexico, they said.
No further details were provided on the fresh produce that was being transported.
The shipment was selected for further inspection, which led to the discovery of 10 packages of alleged methamphetamine and five packages of alleged cocaine.
CBP officers seized the narcotics, the tractor and arrested the driver who was then turned over to Homeland Security agents for further investigation.
In September U.S. authorities discovered a massive haul of cocaine hidden in Dole-brand boxes of bananas that were due to be given to a Texas prison.
The Texas Department of Criminal Justice found the drugs when officers went to pick of the two-pallets of fruit being donated to the prison and noticed someone was off about the weight of them.