A couple of “primary sources” which will likely be a useful reference down the road:
First, the “charging document” laid before the Ontario Court of Justice in which the Conservaitve Party of Canada, Senators Irving Gerstein and Doug Finley and two former party officials, Susan Kehoe and Michael Donison, are accused of violating Canada's election laws.
Charge Sheet for Conservative Party, Doug Finley, Irving Gerstein, Susan Kehoe, and Michael Donison
Second: The 57-page “Reasons for Judgement” released by the Federal Court of Appeal when it overruled a Federal Court of Canada judge in deciding that Chief Electoral Officer was right to withhold rebates for the expenses at the heart of the “in-and-out” affair. This Federal Court case is a different one than the case that will be heard at the Ontario Court of Justice. But though the issues before the court are different, both sides are expected to rely on some of the same evidence and some of the same arguments at the court of justice.