What's up with the Danvers fire chief?

Danvers resident Dan Kennedy doesn't get the fire chief's refusal to let federal chemical investigators on the explosion scene:

... Those of us who live in Danvers deserve an explanation as to why the CSB isn't being allowed in.

On Blue Mass. Group, Ernie wonders that the chief might be hiding:

... The report may conclude "Perhaps this would not have happened if the code violations had been observed by local fire inspectors during their routine inspections."