The ratio of people seeking legal services to professionals providing those services is many-to-one. If it weren't so, lawyers would have to charge their annual income for a single consultation.

What this means for you is that the vast majority of legal-keyword searches will be moving the wrong direction -- from layperson toward lawyers.

If you spend your money on those keywords, you'll be wasting your advertising budget attracting the exact opposite of legal professionals.

If you'd like advice on which specific keywords phrases to target, you'll find yourself paying someone due to the time required to gather appropriate data. SEM agencies exist for this reason. You're also welcome to give me a call for recommendations or to outsource some of the keyword research. No day goes by when I don't research such questions, albeit from a different angle.