I can speak to the context you're talking about in terms of the visa restrictions that were placed in 2014. Part of the challenge with this is that there really is also the combined possibilities of criminalizing those who are potentially trafficked or who are vulnerable to trafficking or who are victimized otherwise.
With Romania, I know there was a pretty large-scale case at that time that was touted throughout the media of labour trafficking that had taken place. Through that, there weren't any of the protections that need to be in place from a human rights standpoint, and that did actually result in some deportations of family members and others who were victimized by trafficking.
Part of the best practices around anything in relation to visas in that context is to ensure that we're not being restrictive in the case of trying to exclude people from being able to come in, while also seeing that when people are victimized, they're not deported and criminalized for coming forward or for being involved in testifying, even.