I entirely agree: ways will have to be found to ensure that funds come from the people who say they are contributing. Furthermore, the passage of Bill C-24 added a section to the Elections Act providing that it is an offence to attempt to circumvent an aspect of the act. That section gives us enough latitude to establish that money has come from another source, that that isn't right and that it hasn't been properly done. The current Elections Act has what it takes to do that. However, it still takes evidence to do that, and that's not always easy.
On June 1st, 2006. See this statement in context.