On the contrary, if I WERE planning to shoot the cop, wouldn't it be advantageous to me to FIRST "put him at his ease" by informing?
I was never really "put at ease" by someone informing me they were armed. Especially when the guy informing me was wearing a vest that said "Outlaws M/C" on the back.
Some older (60's?) moron locally just went to prison for shooting a guy who wasn't a threat during a road rage incident. He didn't look particularly threatening and he had a CPL, but he was a whackjob nonetheless. Informing or not informing, CPL or no CPL never meant anything to me on a traffic stop. Never influenced whether they got a ticket or not, and never resulted in a half-hour roadside conversation about guns either. I would estimate that my department sends at least a couple of letters per week to the county gun board regarding CPL holders who have screwed up. A CPL only means you met the minimum standards for getting a CPL. That's all, and that ain't much. It's not a "good guy card" by any stretch of the imagination.
Just follow the law and use common sense.
Incidentally, I never wrote anyone a ticket for something I didn't observe myself. And I certainly never wrote them a ticket when they had an tail light out and they said they thought they were speeding. That's ridiculous. I don't even KNOW anyone who wrote a ticket under those circumstances. If they said: "Because you saw the blood from the guy I just shot and put in my trunk draining into the street in front of the liquor store I held up", yeah, I might write him a ticket for littering......
My traffic stop line went like this: "Can I please see your license and registration sir?" "Why did you stop me?" "I'll be glad to let you know after you show me your license and registration." I'm not about to argue with people at the side of the road about whether they ran a light or not. People like to argue with you before they give you their license. If they give me their license, I tell them why I stopped them. If they want to argue, they can argue with the vacant space at the side of their car while I'm in mine running them on the computer and writing a ticket, or not writing a ticket. If they refuse to give me their license, I tell them to get out of the car. If they refuse to get out of the car, I call a tow truck and stand there and watch the wheels turning as they try to decide if I'm bluffing or not.
Lots of cops are killed on traffic stops every year, whether from getting hit by other cars or as a result of more nefarious means. I try to minimize my time standing at the side of the road at bar closing time, arguing a civil infraction with someone who is not used to not being in charge. It can be done in a professional, yet firm manner so as to let the person stopped know that they're not in charge of the stop, and that the sooner they comply with lawful orders, the sooner they can be on their way with a ticket, or not. Also, lest you think I get off on being "in charge" of some poor schmuck who ran a red light; A bad attitude from someone, unless it's REALLY over the top, is not likely to influence me one way or the other as far as giving them a ticket. Most cops HATE doing traffic enforcement just for the sake of doing traffic enforcement, but a LOT of actual bad guys are caught as a result of traffic stops. And not all of them "look" like bad guys.