Actually, Peter, what you are saying is technically not correct.
A lawyer is someone who is a practicioner of law. You can be a lawyer in Ohio without being admitted to the Ohio bar. For example, you might be practicing in federal court only, without having attempted to obtain permission from the Ohio Supreme Court to practice in the courts of the state.
You might also be practicing in Michigan, living in Ohio.
You might also be engaging in the unauthorized practice of law.
Anyone can say they are a lawyer, though there are attendant risks from doing so without authorization to practice the law.
By contrast, if you are admitted to practice before the courts of the State of Ohio by the Supreme Court of that state, you are an “attorney at law.” You are an official officer of the Ohio court system, and have the authorization to practice before the courts legally. You can engage in all the functions of a lawyer, such as giving advice, representing in court, etc.
So, by example, I am a lawyer, and I live in Ohio. I am not an attorney in Ohio, because I’m not admitted to the bar here. I am an attorney in California where I am admitted to the bar.
I’m not certain exactly what the OP wants to “prove.” If the point is to prove you can’t practice law in Ohio without permission from the Ohio Supreme Court, that is true, with the caveat that you can practice before the federal courts here without Ohio’s permission. However, to get federal permission, you have to have obtained the permission of SOME state at some point in time; I was sworn to practice before the federal courts in California at the same proceding where I was sworn in to practice before California’s courts. If I wanted the federal districts in Ohio to allow me to practice, I’d have to ask them for permission to do so.
It should be noted that you don’t have to pass the bar exam in Ohio to become admitted. If you are admitted in another state, if you have been actively practicing law for 5 out of the last 10 years, and if you have a relatively clean record, you can petition the Supreme Court here for permission to practice without taking the exam. It forces you to undergo the same background check as if you were taking the exam, and it does require that you have been admitted in another state, and I’m not sure there are any states any more that don’t have some flavor of bar exam.
Hope that helps someone.