An Alberta RCMP officer has been found guilty of one count of assault and acquitted of a second.

On Monday, a judge in Leduc, Alta., found Const. Eric Pomerleau not guilty of an August 2012 assault, when he pepper-sprayed a teen who was in custody in Red Deer, then forced him to the floor and punched him.

Last week, an Edmonton judge ruled that Pomerleau was guilty of assault for using excessive force after he arrested a man suspected of impaired driving and brought him in for processing in Red Deer in December 2012.

Surveillance footage showed Pomerleau having an argument with the man after he refused to sign some documents.

The man was eventually taken to the floor and punched three or four times.

Pomerleau will be sentenced in Red Deer court on July 19.