I haven't read the article yet, but as to AD's question, the state law you referred to will not only determine the usury rate, but also what constitutes a "loan" subject to those rates.
In some cases you may find that an overdraft with a flat fee for processing is not a loan, but if there is a daily fee, it could be determined that it is a time-price differential and therefore interest, subject to usury.
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Andy Zavoina
Opinions stated are not necessarily that of my employer.