Yes it is, and I can add some numbers to this. A study that I did of a Canadian jurisdiction that involved both, first the card system and then the vote system, found that the overwhelming majority of both complaints and unfair labour practice findings were made against employers. So 78% of unfair labour practice complaints during organizing were filed against employers, and 21% against unions. When it came to findings of violation, 88% were against employers, and 11% against unions. Again it's not something that never happens, but the weight of the problem is clearly with employer unfair labour practices.
On the second aspect of your question about the effects and reductions in certification under the vote system, regarding the U.S. studies that Professor Logan referenced, that context was where there was no time limit on votes. For the studies done in Canada, all of those involved vote systems that had very short time limits of about five or 10 days. These consistently find a significant reduction in certification applications and outcomes in the order of a 20-percentage-point reduction in certification outcomes. Time limits, these clearly suggest, don't solve the problem that seems to be inherent with the vote system. A quick vote is not a solution.