Anon is on a dig looking into how PCR tests could be used to identify evidence of cannibalism. It is possible, based on this
New nested PCR test targets gene specific to farmed shrimp pathogen EHP.
Thus when we determine what gene specific to human biological materials we need monitor, it appears that this tst would be a possible screener. Thus, if the testing machines have audit trails and historical data captured and stored, every PCR test ever taken MAY also contain criminal evidence of cannibalism in some cases.
"The microsporidium Enterocytozoon hepatopenaei (EHP) infects penaeid shrimp and has been considered a critical threat to shrimp aquaculture, causing serious economic losses at shrimp farms in several Asian countries. The target organs include the hepatopancreas and midgut, so EHP infection can affect digestive and absorptive function, resulting in growth retardation. Shrimp could be infected with EHP by cannibalism or by feeding on EHP contaminated live feeds.
EHP diagnosis methods targeting SSU rRNA sequence
Several EHP diagnostic methods have been developed based on the small subunit (SSU) rRNA, including PCR, qPCR, in situ hybridization, and loop-mediated isothermal amplification assays. However, SSU rRNA sequences are not highly specific in discriminating microsporidia and SSU rRNA-based PCR methods may generate false positives in non-shrimp samples. For example, the EHP’s SSU rRNA sequence shared a 90 percent similarity to that of Enterospora canceri that infects marine crabs. Therefore, a more specific PCR method is needed for EHP diagnostics.
New EHP diagnosis method targeting EHP β-tubulin gene
Consequently, we developed a new EHP diagnosis method with two sets of primers designed based on the β-tubulin gene sequence (GenBank No. KX842357, Table 1)."
"Perspectives
In this study, we developed a nested PCR method using β-tubulin gene sequences. This new PCR method is specific to EHP and can be used in routine diagnostics. Also, this method is useful to detect low-grade EHP infection. Additionally, we detected EHP in artemia samples by this nested PCR method. It suggests the possibility of EHP transfer from the live feed to shrimp broodstock. In fields, shrimp could be infected with EHP by feeding on EHP contaminated live feed such as artemia."
https://www.globalseafood.org/advocate/new-nested-pcr-test-targets-gene-specific-farmed-shrimp-pathogen-ehp/