this is a good summary of some of the inconsistencies of forensic science.
https://www.youtube.com/watch?v=ScmJvmzDcG0
we are being taught to be objective and meticulous in analytical procedures, partly because of the Daubert Principle (which states, among other things, that admissible expert evidence procedures must be backed by peer review ) but mainly because of bias and the mentioned, playing for a team, aspect.
One of the initiatives that has come out of the report mentioned in the John Oliver show is the push for ‘court appointed experts’. this means that the forensic analysis will be done by neither the prosecution nor the defense teams, but all the results will be available to both.