Making no comment on the larger picture, I read somewhere that a single DNA test costs $30,000, as I recall.
IIRC, I read numbers of about $7,000 - $8,000 for an inmate to prove exoneration by eliminating their DNA from what was collected at the crime scene. In many cases, it is a two step procedure. If necessary, the first step involves the polymerase chain reaction(PCR) which makes more copies of any DNA that is available. Unfortunately, it may involve tampering with all available original evidence. The second part actually makes the genetic matches or lack thereof. I have more of the subject to study.