I have had Chaperone for one month now.  The first week I "tested" it extensively.  I would see if I got alerts when my daughter left her zones.  I would go onto the site and see if she was at school during school hours.  Everything was great.  Then the second week I got an alert that said she had left school at 8:45 a.m.  I checked the website and it "located" her 6 miles away from her school.  Without retelling the entire story, I ended up having my mother drive to her school and actually check that she was there and that her phone was there.  The ordeal lasted 2 hours.  The whole time the website saying she is 6 miles away from school.  If this had been real I would have been looking in the wrong place for her.  I talked to my local Verizon rep and he said he suspected that somehow the signal was bouncing off a tower and thought the tower was my daughter's phone.  Since that time, I have had 4 more false alerts saying that she has left school.  They all occur around 8:45 a.m.  I check the website and about half the time the site locates her at the same location as that first episode and the rest of the time it locates her as being at school.  This service is $9.99 per month.  Every week I get a false alert.  With summer coming I need this to work.  This is like the boy crying wolf.  How do I know when to believe it and when not to?  The one time I decide it is a false alert and ignore it, will it be the wrong one?