COLUMBUS, Ohio (WTVN) -- For the third time in recent weeks the Ohio State Highway Patrol has made a large drug bust.

The latest drug seizure came on I-70 in Madison County. Troopers pulled over a semi from California for a turn signal violation. A trooper brought in a drug-sniffing dog to search the semi and the dog alerted on the truck. Troopers searched the vehicle and found 53 pounds of cocaine in a false-wall in the front of the tractor trailer. It's estimated to be worth more than $2 million.

The driver, Abraham A. Martinez, 48, of Monrovia, Calif., and passenger, Alfredo Ramos, 49, of Marshalltown, Iowa, were taken to the Franklin County Jail and charged with federal conspiracy to possess with intent to distribute cocaine. If convicted, each faces up to life in prison.

Troopers seized 20 pounds of marijuana on September 18 in Erie County and 42 pounds of cocaine and two pounds of black tar heroin on September 23 in Wood County.

Ohio State Highway Patrol Staff Lt. Anne Ralston says troopers are focusing more on stopping drugs from going through Ohio and keying in on commercial vehicles which can carry much larger quantities.