Yes - in some cases.
First, overlap between sites is fine. It doesn't matter if a question is on topic somewhere else; that's no reason to eliminate it from a different site's scope. There were some issues when HSM sprang up, because Mathematics, Physics, and other sites allowed history-related questions. I participated in several meta discussions on these sites. While Physics eventually decided to not allow history questions, Mathematics and other sites continued to allow them. So we should not make our decision based on Law.
I do agree that, so far, the legal questions have not been great. But in the future, they could be. I wrote in a comment
I agree with @TomvanderZanden; a good case could be made for keeping this here. Laws and regulations can be a huge influence on an industry; the allowance or ban of certain products of said industry would seem to be relevant here. Remember, questions can be on-topic on multiple sites.
Regulatory measures can be extraordinarily important in a industry. If we had a site about making socks, should questions about whether or not is is legal to make socks with material X in the United States be off topic? I would argue no; this could be an important part of sock-making.
We have the same situation here. Some legal questions can be important; I would argue that questions regarding which materials and devices are legal should be ones we aim for. The legality of Filament A could be really important to a project.
That's not to say that all legal questions are fine. As has been said, some of the ones we've had so far haven't been great, and I would advocate sending them to Law. But I strongly disagree that just because of the examples we've seen we should not allow legal questions. There are good ones out there; we haven't seen their full extent yet.