Just a quick drive-by (still crazy busy). I think it's an important level-set here to be clear that autosomal DNA as tested by our popular, inexpensive, direct-to-consumer services is never used as an evidentiary exhibit in forensic criminal, parentage, or individual identification legal cases. I believe not anywhere in the world, but certainly not in the U.S.
Our common tests use a $5 microarray chip to look at approximately 650,000 autosomal single nucleotide polymorphisms. On average, about 15%-20% of these SNPs are selected for examination because they have possible clinical/medical relevance, meaning they are exonic data and in that part of the genome where all humans are ~99.4% identical. Not useful for individual identification. Too, an average of about 1% of all the SNPs examined by our cheap microarray tests come back as no-calls, meaning that the chip either had a faulty probe at a particular locus, or couldn't accurately determine what nucleotide was present.
I won't say autosomal SNP data will never be used for forensics, but I think whole genome sequencing will be required for that. The SNP data from our genealogy tests cannot be converted to the type of data used in forensics. Apples and oranges.
Forensic DNA relies on autosomal short tandem repeats, or microsatellites, not a relative handful of tested SNPs that are spaced out across the 3.2 billion base pair genome. This is essentially the same type of process that's used to test STRs on the Y chromosome...and one reason it's confusing to some why our autosomal tests cost $49 but a low-level, entry-point Y-STR test costs over $100. STR testing doesn't fragment the DNA with restriction enzymes and use a once-and-done application of the precipitated DNA solution on a microarray chip. A more manually intensive and expensive process is used (traditional Sanger sequencing or similar) to multiply the DNA and then examine, with multiple passes, specific stretches or segments of the chromosomes to accurately count the number of times a nucleotide sequence repeats across pre-identified, contiguous loci.
To sum up, I could give you my raw data results from my Ancestry or FTDNA or 23andMe tests--or all three--and it wouldn't be possible to reconstruct CODIS/NDIS-type forensic STR evidence that would be admissible as an evidentiary exhibit in a court of law. That's not what CeCe and other "forensic genealogists" do. They don't point to an individual and say, "Here's the evidence. Book 'em, Danno." (A throwback reference to the original Hawaii 5-0 TV series; raise your hand if you got it.) 
"Forensic genealogists" do basically the exact same thing as one of our Adoption Angels: they look at possible DNA cousinships and online family trees and deduce the potential branch(es) where the unidentified person might fit based as much--or typically more--on the genealogy and possible geographic locations and broad birth/death/age ranges as the DNA. CeCe merely provides licensed law enforcement officers with a narrowing of the prospect list. A very bad analogy, but: it's like going from "we know there was a getaway car" to "we believe the getaway car was a late model, gray or silver Toyota Camry with Arizona license plates and damage to the driver-side quarter-panel."
CeCe provides a lead pertaining to a cold-case. It's law enforcement that takes that lead, chases it down and investigates it, builds the criminal case, and makes the arrest. Part of that activity will be to obtain a new forensic DNA sample from the suspect...because even if he took an Ancestry DNA test himself and a subpoena gets that raw data from Ancestry, it can't be used as forensic evidence in a criminal case.
I have fingers crossed on both hands that, as John expressed in his answer, the TV series goes a long way to show that nobody has ever been convicted of a crime with info someone uploaded to GEDmatch. Can't be used as forensic evidence. All GEDmatch--and folks like CeCe--can do is be like the tech guy who can use streetlight camera data and some innate smarts to determine the "getaway car" was probably "a silver Toyota Camry with Arizona plates and some fender damage."
