Sadly they never seem to learn about it despite the risks being known of treating them as magic wand auto-wins instead of pieces of evidence. From the absolute criminal garbage of bite mark identification junk science, DNA science using tests skimpy enough to false positives as their databases grow and they misuse what it statically enough for 'eliminating any non-matches in the pool of suspects' to pools of millions including vast numbers of non-suspect and non-victim samples which basically guarantee a conviction of an innocent statistically via lack of precision.