Liars
A good analytical chemist has to have a special respect for the truth. I've seen people try to make things up as they go along (which is probably how they got through school) and when they get caught, it not only is not pretty, but typically creates a lot of rework (or batches and batches of product that now go to an incinerator instead of a customer).

Telling lies well is harder than people think. Liars with intelligence tend to be people who were told as children that they were Special, and they never noticed that there are a LOT of smart people in the world, people with the ingrained habit of sifting evidence and sorting it out into a logical order. They've never noticed that a lot of people have the patience to sit quietly and let the evidence accumulate, either.

Which is probably why liars don't like me.