Police say they found two loaded magazines and a gun holster without a gun in the semi-truck.
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Authorities also released the mugshot of the man who was driving an 18-wheeler.
On Sunday, the Montgomery County Sheriff's Office released 51-year-old Christopher John Lubowski's mugshot following his arrest.
Lubowski was charged with evading and possession of a controlled substance.
Documents show he was booked into the Montgomery County Jail at about 1 a.m. on Sunday.
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SEE ORIGINAL REPORT: Florida man driving big rig arrested after leading officials on high-speed chase through 4 counties
On Saturday, the chase began in Montgomery County when the Roman Forest Police Department responded to a report of reckless driving.
Lubowski allegedly led authorities from interstate to highway, driving over medians, through red lights, narrowly missing cars, and sideswiping others.
The chase passed through Harris and Fort Bend counties and ended with the help of several additional Houston-area agencies, including the Houston Police Department and the Department of Public Safety.
Eyewitness News obtained video from Roman Forest police, showing the big rig making a U-turn in the middle of the highway before driving right into oncoming traffic.
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ABC13 obtained exclusive dashcam video from a driver, showing the moments before the crash where a driver was hit by the big rig near Katy Mills.
Police tell ABC13 that they believe that Lubowski was rocking the steering wheel, causing the 18-wheeler to rock.
According to authorities, Lubowski was powering through dense residential neighborhoods and was forced to stop in a Fulshear neighborhood in Fort Bend County.
Police told ABC13 they had to shoot the tires off of the big rig to get it to stop. When Lubowski was arrested, police said they found meth inside the truck's cabin.
Police also don't believe Lubowski has a criminal history.
Lubowski is expected to be seen before a judge on Monday.
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