Admittedly I have only read the posts on page one, and this maybe too late to benefit anyone, but here is the California Penal Code definition of Stalking:
646.9 Stalking
(a) Any person who willfully, maliciously, and repeatedly follows or willfully and maliciously harasses another person and who makes a credible threat with the intent to place that person in reasonable fear for his or her safety, or the safety of his or her immediate family is guilty of the crime of stalking, punishable by imprisonment in a county jail for not more than one year, or by a fine of not more than one thousand dollars ($1,000), or by both that fine and imprisonment, or by imprisonment in the state prison.
I have personal knowledge of many cases of stalking, two interesting ones are examples.
A woman noticed her toilet seat was in the up position, when this happened several times she called the police. They investigated and found nothing. This one 'clue' occured over several months, she would go to work and upon returning the only thing she would find disturbed was the seat up in the position a man might do when urninating.
Finally she convinced the local police to come again, and one officer decided to bring the dog. Almost immediately the dog found the intruder living in her attic, a former boy friend was arrested and convicted of stalking.
Another case involved an ex-husband living in the crawl space of his former wifes parents house. She had moved out and returned with their children to her parents home, a corner lot in a very nice residential area. This guy would hop the fence and enter the crawl space from the unsecured access and record conversatons.