It's not the first time it's been done, nor will it be the last.
The militarization of the police, coupled with an increasing number of "no-knock" warrants, is creating a situation where criminals can profit by impersonating these "agents".
There is no legimitate reason for the police to conduct "no-knock" searches (except in a kidnapping situation, or other extreme scenarios).
And the most disgusting examples are the actual sworn policemen who have absolutely no regard for the Law which they are sworn to uphold. You know, the kind who will go into Court, swear on a Bible, and then lie their a**es off to save another criminal cop from a stint in the Big House.
They are the very worst, most dangerous kind of police impersonators.
Now, if we can just get the police to quit impersonating criminals raiding homes, we'd be set.