There are uses of technology that more or less impinge on privacy. Certainly voluntarily checking in at some point and sending in some pre-arranged symbol or signal I think would be the least invasive.
There is the electronic monitoring bracelet. I recently testified at a Senate committee that unfortunately, at this time, from what we can see—we are doing a privacy impact assessment with Correctional Services Canada—this bracelet is not entirely accurate. Right now, not only does it not guarantee real security about the person's whereabouts, but it hugely invades the privacy of the person. The person reading the monitor knows everything that person has done, not all of which is necessary to know, whether they're going to leave the country or, in the case of inmates, whether they're going to commit another offence.