By John Tedesco
San Antonio Express-News
On the hot afternoon of May 7, 2008, Joseph Cannon was driving in Leon Valley when he glimpsed a black Nissan Pathfinder barreling the wrong way along Evers Road, speeding toward him.
There was no time to think, no time to react. Just a deafening crash as the Pathfinder slammed into a Cadillac in front of Cannon.
In high-speed chases, police make life-or-death choices