Well in the first place DNA tests are expensive and complicated. People usually need to have a pretty good reason to order a DNA test. Not every lab is equipped for DNA analysis.
The story of a runaway daughter leaving an unwanted child on the doorstep of the parents is plausible. In hindsight of course it is suspicious but with the information known at the time, there really was no cause for an expensive DNA test.
This is what makes this crime so heinous. It is so crazy that no one could even contemplate a father keeping his daughter in a basement for 20+years and then try to move the children from the multiple rapes into his "overt" family upstairs.
Perhaps one of these days DNA testing will be common place. But the expense and complexity today prevents this.
If it were up to me, all prisoners on death row or in life sentences should be DNA tested if there is applicable DNA type evidence available.
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abusus non tollit usum - A right should NOT be withheld from people on the basis that some tend to abuse that right.
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