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。
2
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.