Back in the day, I knew loads of stupid lawyers, and a few clever ones as well.
Consider the lawyers who defended Sally Clark who was convicted of killing her children on the evidence of Roy Meadow. This pediatrician cococted a nonsensical statistical theory that the chances of two cot deaths being natural was 70 million to one. The real figure is 70 to one. Here's the rub. Nobody in the court asked Meadow what his theory was based on and what his qualifications in statistics were. (The answer was an article in the Lancet and a calculator. His training in medical stats was er nil.)
Two other women were convicted on the strength of Meadow's Law, but no lawyer challenged his evidence at first instance.