release any information because it takes time to get all their little cover-up duckies in a row.
In Ferguson, the cops had such a long history of getting away with things that they put out information of a sort that couldn't fool a first-grader, even though it would have sufficed in every situation in the past--just as it is still accepted by those who always think it justifiable when a cop harasses and then kills a black man.
As a result of their release of such weak excuses, they are getting burned nationally and internationally. Furthermore, because the info they have released has already been shown to be contradicted by actual evidence as well as several coinciding eyewitness accounts, even though they have clammed up now, and Wilson is being kept hidden and silent, their release of flawed cover-up claims makes it that much harder to construct a plausible defense now.
By keeping silent while they figure out the best narrative to accommodate the available evidence, the police department in this case are probably doing their best to prevent some late revealed evidence from scuttling their story.
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