[0]: https://www.militarytimes.com/flashpoints/2020/01/23/deploye...
[1]: https://www.theguardian.com/politics/2019/dec/17/tories-swit...
Not a joke, for real.
They are experts at getting you to talk to them even if you know this. They are experts at getting you to say things that incriminate you or your friends -- that you or your friends have done nothing wrong (in your opinion/as far as you know) will not protect you.
The only answers you should be rehearsing or thinking of in advance are "I would like a lawyer" and "I would like to remain silent." They are rehearsing how to get you to say incriminating things, a lot. Rehearsing or thinking up any other answers only plays into their strengths. Even knowing this, I've been tricked into talking to them, to my detriment. They are really good at it.
> Not a joke, for real.
Obligatory link to the fantastic "Don't Talk to the Police" lecture from the Regent University School of Law.
Watch the whole thing:
(fair warning, this will autoplay the word 'Fuck' in the first 10 seconds)
You (or your friends) can go through serious inconvenience and pain, from lengthy and expensive legal battle (during which you may not be allowed to leave the state etc), to conviction and sentance, even if you don't think you've done something wrong. Innocent people and/or people who didn't realize they were breaking a law get convicted all the time.
Talking to the cops will not help your situation. Not even when they say "Look, we may have it wrong, if you just tell us what happened we can get this all cleared up." Not without a lawyer.