This argument troubles Steven Erickson, a forensic psychologist and legal scholar at Widener University School of Law.

这个论点让威得恩大学法学院的法医心理学家和法律学者史蒂芬-埃里克森闹心。

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The usual argument is that the underlying procedures for forensic DNA testing were developed in laboratories where pure and known samples were used and retesting always was an option.

通常的争论焦点是法医dna鉴定的基础程序是在实验室中完成的，而实验室中采用的是纯净的和已知的样本，再次鉴定始终是一项选择权。

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The usual argument is that the underlying procedures for forensic DNA testing were developed in laboratories where pure and known samples were used and retesting always was an option.

通常的争论焦点是法医dna鉴定的基础程序是在实验室中完成的，而实验室中采用的是纯净的和已知的样本，再次鉴定始终是一项选择权。

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