Well you can just... look them up. Some of these were new to me (e.g. firearm ballistics). But when it comes to stuff like the unreliability of drug tests or bite mark forensics, it's not at all a secret. Any recently published meta analysis would suffice. In fact I'd be shocked if you could find any in support of these methods.
Why put the onus of the work to quote a bunch of articles on the OP when these are all very easily verifiable with a tiny bit of effort
Drug metabolites are measured repeatedly and precisely, as is a forensic bite analysis . Not sure how you can claim those are unreliable when they are used daily. GC/MS is a good start for drug testing..
> Drug metabolites are measured repeatedly and precisely
Drug metabolites are measured repeatedly and precisely, assuming no one mislabeled anything and the machine is well-calibrated and the technicians are honest even though they know who chooses which lab to use and the sample was collected fastidiously and not contaminated with anything.
But drug metabolites aren't drugs. Eat a bagel with poppy seeds and you can test positive for opioids. Take certain decongestants and you can test positive for meth.
Law enforcement does all sorts of sketchy things in order to get a conviction. Why is it a surprise that they use pseudoscience that juries eat up because they've seen it used in their favorite police procedural TV show hundreds of times?
Why put the onus of the work to quote a bunch of articles on the OP when these are all very easily verifiable with a tiny bit of effort