Primary sources require disciplined listening. Individuals involved in an activity consciously and unconsciously tend to convey fact tinged with a little haze. The haze can structure a narrative that is highly directed on the objectives and intent of the source. If you are a proponent of enforcement then the truth you convey will be from that perspective and may miss details or perhaps orients details from an enforcement perspective. The haze also tends to be an attempt to make the source appear more favorably to what he thinks you value. Sometimes this takes the form of someone repeatedly trying to validate themselves in your eyes with name dropping, mentioning of extensive accomplishments, and favorable anecdotal asides.