What single factor is widely believed to contribute the most to the criminal justice system's fallibility?

Question

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Unsatisfactory legal representation is widely believed to contribute the most to the criminal justice system's fallibility. This is due to the fact that many individuals cannot afford competent legal representation, resulting in inadequate defense and wrongful convictions. Additionally, public defenders are often overworked and cannot give each case the attention it deserves. This results in a lack of proper investigation, failure to challenge problematic evidence, and a failure to advocate for their client's best interests.

What Single Factor Is Widely Believed to Contribute the Most