NOTA BENE: Since having posted this, I have been retired and my website is gone. I still have the documentation I'd posted there, though it may now be out of date. Anyway, if you want anything, let me know by PM or email (see profile:status for email address).
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Take a look at my website, and scroll down to where it says, "other useful stuff" - there's a PDF file there you can download and copy called "letter to law enforcement". Use the letter and there's no need to talk at all - not only that, but the letter's well-documented, so if you produce a copy in court with testimony that you gave it to the cop and the cop ignored it, well, too bad for the cop.
On the other hand, I was asked today to review some video data produced by a local sheriff's office about what to do in a traffic stop. For security reasons, I don't allow the software required to look at it on my computer. I strongly suspect that law enforcement agencies have their own version of semi-benign "virus" software that takes advantage of the security holes created by that software. I have actual knowledge from prior court cases that they do that in many circumstances, especially where child pornography is involved. Since this is a law office, I can't take chances with my computers, so I never saw what they produced.
Also, I have a history of doing personal defense law seminars and teaching the part-three legal lecture in the NRA personal protection classes, and I don't think I'm going to do that any more. Here's why, summarizing what I told the guy who asked me to review the video: "The current trend in such public announcements is, 'you can forget about cops being subject to the law, they don't know and they don't care - watch out and be really careful because if they shoot you, it's your fault.' And there's a good reason why they're like that, it's because many prosecutors and judges are like that. It is an increasingly corrupt age. My opinions are all about what the law says, but that's all out the window, so I don't know what to tell people anymore. You can't rely on the law working, because the people who manage The System aren't intellectually honest or reliable."