The relationship between a DA and the local police chiefs is a ticklish situation. You want to have a professional relationship, but you don't want it to be so close as to interfere with your duties as a prosecutor. For an interesting article on how Dallas County DA Bill Hill is handling that relationship following the "sheetrock" drug problem, read the article in the Dallas Observer.

For another example of how the relationship between DA and police chief can get ticklish, see Houston Chronicle regarding current HPD lab problems.