In certain cases, yes, I think it's certainly a reasonable thing to do, if you know there's a high likelihood the species are going to come in and there is no other way to do it.
Some other jurisdictions in the United States—California—is afraid of invasive insects coming in and destroying their agriculture system, so they set up these highway checkpoints and now these same checkpoints are being used to check every boat that's being trailered into the state. They want to make sure that people are not bringing invasive species, like zebra mussels, into the state on their boats.
In fact, the northwestern U.S. states are doing the exact same thing now. They now relate their findings to the Government of British Columbia to let them know. I think last year there were three boats destined for B.C. that had zebra or quagga mussels attached to the boats or the trailers, which were intercepted on interstate highways before they ever got to Canada.
People have to be made aware that they are part of the problem or they can be part of the solution, both anglers and boaters.