Stream of horrific crimes takes toll on town cops

TRACY, Calif. — Detective Nate Cogburn's last few months have been filled with the stuff of nightmares. Neighbors charged with shackling and torturing a teenager in a Tracy home. A substitute teacher accused of molesting upward of 15 students. A surgeon arrested for the alleged sexual abuse of dozens of patients. And, most recently, a Sunday school teacher charged with kidnapping, raping and murdering the playmate of her own little girl.