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DENVER - Ryan Nuanez is accused of crashing an SUV into Accent Optics on South Colorado Boulevard Saturday morning.
Denver Police said Nuanez, 24, and four other people were rushed to the hospital. The 60-year-old business owner was reported in critical condition Saturday afternoon.
Nuanez remained at Denver Health Medical Center on Sunday morning. He's in police custody at the hospital and faces multiple charges, police said.
The crash happened just after 10 a.m. at 2795 S. Colorado Blvd. The intersection of Colorado and Amherst was closed by police as rescue operations continued Saturday morning.
Eyewitnesses told 7NEWS weekend anchor Christine Chang they saw the Chevrolet Tahoe going north in southbound lanes on Colorado Boulevard at a high rate of speed.
Investigators said they recovered evidence that impaired driving may have been a factor in the wreck. They believe it to be a drug or narcotics -- not alcohol. They are awaiting a lab report to confirm.
Firefighters worked to shore up the building but said it was unstable.
7NEWS checked court records and found Nuanez is currently on probation for two different cases in Jefferson County.
In February of this year, Nuanez pleaded guilty to felony charges of theft and providing false information to a pawn broker. He was sentenced to two years of probation, court records state.
In a separate case, Nuanez pleaded guilty in October 2013 to misdemeanor theft and was sentenced to two years of probation, court records state.
In January 2013, he was charged with reckless driving in Douglas County. But prosecutors amended the reckless driving charge to a lane violation and Nuanez pleaded guilty to the lesser traffic violation, court records state.