Maxam60 -

The requirements in Canada vary between each Province or Territory. In most, if not all locations, your son's background and training most likely exceed any existing requirements. You would have to check with the Occupational Health and Safety agency for the Province or Territory to which your son desires to move to or work in for specifics.

Using Google, Search:

Occupational Health and Safety (insert Province or Territory)

Yor son should be able to reach a home page web site that will give contact information for the specific Province or Territory.