If you want to get into expert testimony, don't pursue law education. Pursue a masters level engineering education and valuable work experience, then build a resume of credentials tied to a specific corner of your field.
If you want to get into law, stash your engineering bachelors degree and go to law school. Engineering degrees are looked favorably upon by law programs, so you actually have a pretty good leg up on this path.
Both are rewarding paths. The low end of the law business is lower than the low end of engineering, but the top end is much, much higher when rated by $$ compensation.
If you wanted to be some kind of high powered blend of engineer and lawyer, you'll probably want to take the first path, then mid career fill in the second path. But you won't be doing expert testimony in your cases if you're the trial lawyer in the case, you'll still have to bring someone else in to fill that role. Can't interview yourself on the stand, and even if you could, it wouldn't be credible to do so.
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