The Cultural Property Export and Import Act requires that to be protected, to come under export control, objects must be at least 50 years old. In the case of military insignia and accoutrements, there is a minimum threshold of $3,000. So under the existing legislation, for medals less than 50 years old, if my esteemed colleague would help my mental arithmetic, I believe that would take us back to approximately 1960. Any medal since 1960 would not fall under the export controls, nor would any medal for which the current market value is less than $3,000.
The value of cultural property at any given time will vary according to market conditions, so I couldn't say all of these medals are therefore excluded from that and all of these are included. A medal that belonged to somebody of extraordinary recognition in Canada, because of the association with that individual or because there was a group of insignia belonging to a particular individual, might very well hit the threshold, whereas the same medal awarded to somebody less well known might not.
So I really can't give you a precise answer in terms of categories of medals that would be reliable over time.