This is a very good question. The reasons a prosecutor would withdraw a charge are those I mentioned. They either saw that the probability of conviction was very low, or they lacked information to go on and pursue the case. It could even be that it's not in the public interest. For example, these are documented reasons why a case could be withdrawn.
In this particular case, and in other cases that are going through the criminal courts in each province, we don't have the information specifically as to why the case was withdrawn. The only thing we could do, as Mr. Nicholson suggested, is to try and see if these cases are coming back in the system under another type of charge, for example. It remains something we could look at, and certainly it's an avenue we could explore.