For sure, there's a disadvantage to anything that has advantage, but I believe that science is methods of enquiry, before it's put to law there must be group of researhers that must have arrived to the same proven knowledge.
So in this light, I believe that for most errors that occur in the use of this technology mainly associated with some errors/mistakes in the procedures that produce the results.

That's why genealogical and forensic science is in particular very careful with their samples of study
But the funny part of the errors gotten most times leads to new discovery or research.

I'm pretty sure, that's where the knowledge about Chimerism evolved

Thanks for this blog, I just came across it through @lemouth, just like he said your post really add complement to my recent post