INDIANAPOLIS -- Troopers confiscated 15 kilograms of pure cocaine -- worth about $1.5 million if it were to be diluted -- during a traffic stop Monday night on Interstate 65, the Indiana State Police said.

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Police: Drugs With Potential Worth Of $1.5M Taken From Car

The drugs were found in a hidden compartment of a vehicle that was stopped because it wasn't properly displaying a license plate, police said.

Police arrested the car's driver, identified as a 17-year-old male.

Police said they believe the drugs (pictured, left) were being delivered from Chicago to Indianapolis.

A trooper made the stop around 8 p.m. on southbound I-65, just north of the 71st Street exit ramp, police said.

A second, Spanish-speaking trooper arrived to speak with the driver, who apparently could speak only Spanish. The driver didn't initially tell police where he had come from or where he was going. The vehicle was not registered to him, police said.

Because of these circumstances, the troopers searched the vehicle, leading to the drug discovery.

Federal authorities are expected to get involved in the case to help track the drug supply, RTV6's Vicki Duncan reported.

A kilogram equals about 2.2 pounds.

One kilogram of pure cocaine has a street value of about $20,000, according to police. However, if the cocaine were to be diluted, the same kilogram would have a street value of about $100,000, police said.