I went and asked on meta.Law.SE and got this response from two of their mods:
You should feel free to migrate posts that ask legal questions without asking for legal advice.
Of those remaining: Many questions asking for legal advice can be "genericized" so as to ask for legal information.
So if we can encourage users to transform "what should I do?" questions into "what does the law say?" questions, then they would be happy to have them migrated.
As @WhiteWinterWolf also said, this clip from their help page says it all:
Law Stack Exchange is for legal professionals, students, and others with experience or interest in law.
Please don't ask questions seeking legal advice on a specific matter. These are off-topic for Law Stack Exchange. While users generally contribute answers in good faith, the answers are not legal advice, and contributors here are not your lawyer.
So that's pretty clear that Law.SE is not a free lawyer service; they want to discuss general points about the legal system, famous historical court rulings, trade tips about being a legal professional, etc; they don't give a dime about your problems.
Many of the questions like this that I've seen on security.SE should really be closed with "You need to hire a lawyer dude" -- they won't be any more welcome on Law.SE than they are here. Although a few are more like legal thought-experiments that may be interesting to others.
I would avoid putting explicit reference to Law.SE in our help page out of fear that we generate a flood of free lawyer requests. Rather, let high rep users vote to close or flag for mod migration as usual.