Flutterby™! : real officers do not wear ski masks.

Homeowner shoots, kills 2 men in ski masks claiming to be officers, Houston Police Department says.

"[The homeowner] became suspicious, because, you know, they have a ring camera too, and the suspects were saying they had a warrant, but it was just two people and they're masked up and no police cars, no lights or anything like that," said Lt. Khan with HPD.

Via Dave Winer's link blog, with the note:

[HPD Detective Kyle] Stringer noted that real officers do not wear ski masks.