Absolutely.
It tends to be the regulated trades like electricians, for example. They have the International Brotherhood of Electrical Workers that regulates the trade quite extensively. It's a safety-related issue as well. So certainly the electrician trade is out ahead in trying to ensure that its members meet standards.
That's not to say they've managed to overcome some of the issues that arise in moving between jurisdictions, because it's still a challenge. There are 13 different systems. Each system has to be looked at individually, and those relationships have to be looked at one by one.