My experience is limited, but in the Winnipeg example of the young men who were stealing cars, seven of them got their bracelets off very easily. These were teenagers.
I guess the question would be, are you creating a false sense of security by saying if you release the person on bail, at least you'll know where they are and you can always pick them up? Well, you'll know where they are until they don't want you to know.
I'm not an expert, but I've certainly heard that the bracelets can be tampered with. They can be broken, and in some cases they can certainly be removed. I wonder what kind of security you have for the courts in guaranteeing a person—“We'll know where they are, and we can pick them up if they don't come back to court.”—if they can tamper with or remove the bracelet.