Missouri officer who used Taser on teen driver says he smelled pot in car before confrontation

In this photo provided by Daniel J. Haus, attorney for the family, is Bryce Masters with his mother, Stacy Masters. The FBI is investigating after a police officer in suburban Kansas City, Missouri, used a stun gun to subdue 17-year-old Bryce during a traffic stop Sunday, Sept. 14, 2014, leaving him hospitalized in critical condition. (AP Photo/family photo via Daniel Haus) (The Associated Press)

A Missouri police officer who used a stun gun on a 17-year-old during a traffic stop says he smelled marijuana in the vehicle and saw him recording the incident on an iPhone.

Bryce Masters has been upgraded from critical to serious condition at a hospital where he was taken Sunday after the Independence police officer used a Taser on him. A spokesman for Masters' family says he went into cardiac arrest and was being treated for a lack of oxygen to his brain.

According to a search warrant application, the officer smelled marijuana inside the car. Police said they later found drug paraphernalia.

Police say Masters was pulled over because of a warrant attached to the license plate of the vehicle and was combative when ordered to get out.