Texting while Driving

I just came back on the 60 Freeway in Hacienda Heights, about 2:30PM.  90 minutes ago, and there was a matt black Toyota Pick Up truck swerving in his lane.

I figured he was drunk, so I quickly passed him to get into a safer position. As I passed him, I noticed he had his head down, and his hand was going up and down.  My guess was texting!