A man accused of having 43 pounds of fentanyl hidden in the vehicle he was driving remains in custody.

Francisco Jesus Robles was arrested Monday after a K9 officer alerted police to 18 bundles of fentanyl hidden in a vehicle, according to the Mission Police Department.

The bundles were found after police conducted a traffic stop on a 2000 Chrysler minivan at the intersection of Shary Road and U.S. 83. A Mission K9 officer was called to the scene due to signs of criminal activity, according to a news release.

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“A false compartment was discovered on the floorboard of the vehicle,” the release stated. “The search yielded to 18 bundles (19.9 Kilos) of fentanyl.”

Robles was charged with possession of a controlled substance and had his bond set at $500,000.