GPS Tracking

I have mixed feelings about this for the average citizen however for the guilty or those prone to do wrong, this is a great tool. The problem is probable cause and/or past records vs. the innocent. Who is to decide when this tool is used or not? I can see it being used for all those currently on parole where the likelihood of repeat offenses is very high. For other people it would be a bit of Big Brother moving in on our lives.