Funny how we were discussing this very topic today in class. We are currently working on the subject of MVL (Motor Vehicle Law) and the subject of high speed chases came up.
Okay, I could not read through all the thread here, but let me say this: most departments (not all) have what we call pursuit or apprehension policies. Depending on the agencies policy determines whether you will chase or not. Also, above certain speeds and through certain areas, the ranking officer MAY CALL OFF THE CHASE AT ANY TIME. The officer INITIATING the pursuit has to use some some discression (sp?) as to whether it is safe for him or her to continue.
Here's my take on it: depending on the violation, if you have a good description of the vehicle, occupants and a tag number, why chase the dude?? He wants you to chase him, most of those out in LA are done on purpose, with the offenders knowing that they will be on t.v.
This is why helicopters are great tools. We can also use cameras (traffic cams) to aid us. We will get the guy eventually. So maybe he gets away today, we will get him sooner or later, count on it.