SALT LAKE CITY -- A Utah sandwich shop employee has been arrested on accusations he put methamphetamine and THC into the drink of a uniformed police officer.

A probable cause statement filed Tuesday says the Layton police sergeant immediately felt impaired after getting the drink at a Subway restaurant Monday. The sergeant was in a marked patrol car going through the restaurant's drive-thru, reports CBS affiliate KUTV.

He struggled to find the brake pedal of his patrol car at a red light and couldn't answer questions at the police station.

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Police Lt. Travis Lyman says the officer has been released from a hospital and is okay.

Tanis Ukena, 18, was arrested on suspicion of surreptitiously giving a poisonous substance. He denied the allegations.

Ukena prepared the sergeant's drink and was seen with something in his hand as he stepped out of view of a surveillance camera for an extended period of time before returning and handing the officer the drink, Layton Police tell KUTV.

Lyman says police don't know why Ukena allegedly drugged the drink.

It's unclear if Ukena has an attorney. No listed phone number for him could be found.

Subway spokesman Shawn Cook says the company is shocked and is cooperating with police.

Ukena is being held on $10,000 bail.