Actually, it says that someone was let out because she was a secondary chemist. So in other words, if she even came close to working on a case, then it's suspect.

Not to mention, she falsified lab results to the degree that she didn't even do any testing at all on many samples. That's pretty much close to zero time to file the report.

When it comes to intent - she deliberately tainted some samples! Gotta ask yourself why.