There are those who argue that California’s bar examination — the exam that one has to take and pass in order to be eligible to be an attorney — is one of the toughest in the nation.
Aside from taking that exam, and seeing for yourself that the claims of its difficulty are more than largely exaggerated, you could pass it, start practicing criminal defense, and run up against prosecutors who are quite literally incapable of reading. Then you really understand: any lack of reading comprehension is not a bar to becoming a lawyer, and going to work for the government.
What else do I need to say?
People v. Some Poor Kid by Rick Horowitz on Scribd