The location where this took place is kind of a special case in the realm of "man in civilian attire is holding a gun," especially a rifle. In the case cited in the OP, it being a police rifle, it was most likely an AR-15 type, in other words, an
assault rifle OMG!
Same county where the DA forbids anyone on his staff to own a handgun or have a permit for one.
Same county where the policeman in charge of local licensing for gun dealers threatened a local FFL for refusing to transfer a firearm to another cop, apparently illegally. Then orchestrated an warrantless raid, arrested the FFL and seized guns. Then saw all the charges dismissed but refused to return the guns. Then suspended the FFL's local licenses anyway, shutting down his business until he could finally get them back, no doubt after much legal effort.
Then orchestrated yet another raid on the same FFL, plus five others -- on the eve of jury selection for the FFLs lawsuit against the county for the license suspension.
http://www.longislandlawyerblog.com/wha ... tore-raids" onclick="window.open(this.href);return false;
viewtopic.php?f=94&t=42325&hilit=nassau+county" onclick="window.open(this.href);return false;
This is a county with a forum devoted to just the county's rules on firearms ownership, with forum questions like "Can I let someone else shoot my pistol at the range?" (apparently NO, unless they also have a license), and "Can take more than one gun to the range?" (Apparently yes, but the number and how they can be transported...not so obvious.) Where one of the forum members is excited because after 10.5 months, $200+ dollars, an interview, and who knows what other hoops, he finally has a license. Now he can pay another $10 to get another license to buy a gun to go with his first license.
http://www.longislandfirearms.com/forum/b-11/s-35/" onclick="window.open(this.href);return false;
EDITED TO ADD: I forgot to add, when I originally posted this, that Nassau County is also the place that tried to ban "deceptively colored guns." No grandfather clause -- anyone who had a gun that wasn't "black, grey, silver, steel, nickel or army green" would have had to turn them in for destruction without compensation. (Note that all legal guns are registered with the police in Nassau...) I'll bet the cop in civvies had a rifle in the approved color... fat lot of good it did him.
In otherwords, this is a county that fetishizes the demonization of guns, in a city that does the same. "Only criminals have guns." So what is a police officer from any jurisdiction in the NYC area supposed to think when he sees a guy in plain clothes with a gun?
One wonders then, if the police departments just reaped what they have helped to sow.