Popular mechanics has posted a nice article summarizing doubts about the current state of forensic science. The short of it is that it would be nice if there were actual science involved. The current state of forensic science ranges from DNA tests which are known to be quite reliable to techniques like bite mark analysis that may simply be useless. Unfortunately, there is little connection between admissibility in court and rigorous tests that demonstrate reliability.
If you often read about forensic science, there won’t be much that’s new in the Popular Science article. If it’s a topic you’re interested in, The Agitator is probably the place to go. August 2nd: He just posted about the article, and linked to a few more resources.